Exception in thread “main” java.lang.NoClassDefFoundError: start-all/sh Error

When trying to start hadoop, this error message is quite common :

Exception in thread “main” java.lang.NoClassDefFoundError: start-all/sh

Caused by: java.lang.ClassNotFoundException: start-all.sh
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
Could not find the main class: start-all.sh. Program will exit.

Here’s a quick check list to resolve this issue:

  1. Ensure you are calling the ‘start-all.sh‘ from within ‘bin‘. If you are inside ‘bin’ then the call should be ‘./start-all.sh‘ and if you are a level above bin, then try running: ‘bin/start-all.sh‘.
  2. One other common mistake I’ve seen is, people try running : ‘bin/hadoop start-all.sh‘. Please do not prefix ‘hadoop‘ to the start call.


Fixing Problems with Your Hard Disk

All data on your computer is stored on the hard disk drive. Whenever you click on a file, the hard disk spins at thousands of rotations per minute in order to access the file. Over time hard disk storage has grown tremendously, while improving speeds all the time. These devices are also the most prone to errors and failures, which paralyzes your computer.

Not all hard disk problems are unsolvable though. Below are a few problems with your PC that boil down to problems with your storage device.

Disk full

Your hard disk needs some breathing space in order to function normally. When you fill your hard disk entirely with music, videos, documents and other files, it has to work harder to go to the file that you need. That is because files are scattered over portions of the disk. The more disk space you consume, the greater the seek time for your disk.

Ideally, you want your hard disk to be about 40% free. However, you should leave at least 10% free for optimal functioning of your hard disk. If you find your hard disk to be full and slow, try uninstalling any applications or programs that you don’t use. Over time, there is more software installed on your PC than you would like. Uninstalling them will free up a lot of space and make your PC run faster.

Add storage

Alternatively if you think that you need all the programs and files and don’t want to delete any of them, consider upgrading your hard disk. If you are running a desktop, you can buy a second hard drive and transfer all your music, videos and documents to the new drive, thus freeing up a lot of space for system files.

If you upgrade the hard disk on your laptop, you might need to reinstall Windows and all the applications, because there is no place for the older drive. You can also buy an external storage drive and transfer all your media and documents to it. Hard disks are quite inexpensive today. You can buy disks worth 1TB for less than $80.

Avoiding problems

If you use a desktop PC, and find that the hard disk slows down periodically, it might be due to excessive temperature. The hard disk operates at its best when its temperature is between 30?C and 40?C. Install a program such as SpeedFan. It monitors the temperature of your disks and alerts you when it runs too hot.


You might want to ensure that your desktop is placed in an airy part of your room so that it gets proper ventilation. Also take care to ensure that there are minimal chances of dust entering your PC. If you are using a laptop, place it on a raised platform, so that the base is completely touching the ground. The base has a few system fans that run to keep your whole PC cool.

Just follow the above few tips and you should have no problems with your PC and it will run just fine for a long time.

How To Diagnosing Windows Memory Errors

Diagnosing Windows Memory Errors

Certain computer memory errors are simple to recognize. On the other hand, some go undetected. Sometimes computer displays the screen with error code and sometimes it does not.

There is a really nice diagnostic attribute in both Windows Vista and Windows 7, which allows you to recognize and fix memory issues. Several third party utility applications also assist in determining and fixing the memory issues. Whenever your system shows a memory problem, then there might be issue with your memory chip, or simply it can be a hardware problem.

Memory Diagnostic Tools:

Window Vista and Window 7 both comes with the built in Memory Diagnostic tools. This tool generally arises each time when memory problem is identified quietly in the background. If you want to run Memory Diagnostic Tool manually, Click > Start > Control Panel > Search Box > Type “mdsched.exe” or memory > Click > “Diagnose your computer’s memory problems” > then select the time for running Memory Diagnostic Tool.

Always remember that while running this tool your computer will restart. Therefore, it is advisable that you will save all your running programs. In case you are using Windows XP, any reliable third party utility tool can be helpful.

Types of Memory Errors

Memory errors might be categorized in three parts, which are as follows. First, one is data corruption that is generally depicted by missing system files and data loss. The next is computer memory error, and in this error computer is not able to detect the memory installed on it. The last is computer memory boot failure, which makes a system beep and you might even get an overall blank screen. In case you are receiving only beep, you should check motherboard manual for beep codes meaning.

The inbuilt diagnostic tool and windows 7 and Vista is a very handy tool that can help us in troubleshooting many memories related issues without having to install any third party software applications. Although hardware problems require technical assistance and replacing the parts, it does prove to be very helpful when there are windows related memory issues.

Fix Errors While Upgrading Windows Vista to Windows 7

How to Fix Upgrade Errors (Repeated Restarts) While Upgrading Windows Vista to Windows 7

It is quite obvious that people would want to upgrade their old version of operating system to new version. It really is discomforting when you encounter problem while upgrading your system. The users of vista operating system are facing problem while upgrading their operating system to windows 7. 

This problem causes frequent restarts of system that is very irritating. Many people find it very.  Annoying and complicated while upgrading their vista to windows 7, because of these upgrade errors (Repeated Restarts/Reboot).

Users get message that your upgradation process failed and previous version restored you can continue with it. There is a specific notification message will be shown on screen “This version of windows could not be installed, your previous version of windows has been restored, and you can continue to use it”.


This message will be shown on screen every time when your upgradation process fails. It is a very irritating problem. The worst thing is that no specific reasons have been discovered until now behind this upgradation failure. However mechanism of this failure is clear that when you launch upgradation process, Boot Configuration Database (BCD) adjust itself to default windows 7 operating system.

As Upgrading process fails system restore your previous operating system, however BCD continues to make windows 7 your default operating system and proceed to windows 7 setup again and again. Therefore your computer reboot repeatedly.

Now you can get rid of from annoying problem by changing settings of BCD.  If you change the values of BCD, your system will be started with vista operating system, and you will be free from repeated restarts upgrade errors immediately.

Steps to fix upgrade errors

  • Primarily, start your computer.
  • You would see boot menu option during booting (press F8 button if you don’t see), select Vista operating system instead of Windows 7.
  • Insert Vista set up files (download vista SP2 ISO) and exit from the set up menu when installation menu open.
  • Go to Start>All Programs>Accessories>right click on Command Prompt>Run as Administrator.
  • type “X:\boot\Bootsect.exe /NT60 All in command prompt tab and press Enter button ( X is the directory where you have inserted vista setup file)
  • Restart your computer.
  • The job will be done successfully and your system will not keep the booting again and again

Fix The Issues While Viewing Videos In VLC Media Player

How To Fix The Issues That You Get While Viewing Videos In VLC Media Player 

It may be possible that you will get trouble using VLC media player on windows vista. Actually VLC media player requires DirectX to be installed properly.

Sometimes people remove all installed applications to get installed VLC media player. Even many people change default settings to remove that problem of VLC media player, which is not really considered the right way to resolve this problem.

Mentioned below, you will find the instructions to install VLC media player properly in order to fix the problem:

  • First of all you have to open VLC application then go to settings, then choose preferences option

  • Now choose video option and click output modules
  • You will get advanced options box on your screen
  • There is DirectX video output option in the list
  • Finally click save option
  • Restart your VLC media player

Now you should be able to watch your favorite movies of any format in your VLC media player. VLC media player supports almost all the video formats, therefore people choose this player to watch their favorite videos on this particular player. 

All you need is to follow the abovementioned steps to install VLC media player properly. This method really helps you to enjoy the videos in your free time, since is the best player which plays all the video files. Therefore, you need to follow these steps to install VLC player precisely.

Fix The Error Related To Full Browser Cache In Gmail

How To Fix The Error Related To Full Browser Cache In Gmail

Gmail users must be familiar with the error message that appears occasionally while logging into their Gmail webmail interface. The error message which is prominently displayed over the mailbox warns the user that the browser cache is fully filled and is likely to interfere while he/she is using the Gmail Webmail.

To get rid of this message, Gmail presents you with two links, “Fix This” and “Hide”. The link “Fix This” directs you to the “Gmail Help Center” and the other link “Hide” makes the warning disappear temporarily. The warning however appears again the next time you sign in to your Gmail account.

According to Google, the solution to this problem is to clear your web Browser’s cache (In internet Explorer, it would be Temporary Internet Files). But sometimes, you may need to clear the cache several times and restart the PC to totally resolve the issue.

Incase of Internet Explorer 6 and 7, users tend to come across this Browser Cache full issue time and again even if they try to delete the cache (i.e. Temporary Internet Files) several times. The error message keeps displaying every time the user reloads his/her Gmail webmail interface.

Web Browser’s cache is used by Gmail to prefetch the contents of the mails including the attachments, especially on Gmail’s AJAX-intensive view. There are a number of different solutions that are believed to resolve the issue, but they work for a few users while do not work for others.

Below mentioned are the potential solutions to resolve the cache issue with Gmail. Try out these solutions and see which one suits you to ensure the best mailing experience with Gmail always.

Solution 1: Set your Browser to Automatically Check for Latest Versions of the Pages Stored

In Internet Explorer, set the option for checking if newer versions exist for the stored pages as “Automatically”. Other alternatives available are to check each time a user visits the webpage or each time the user starts IE.

Solution 2: Reset Temporary Internet Files (or cache) in Internet Explorer

  • Create a folder (a temporary one) at any location as per your preference (For e.g. C:\TempCache).
  • Open Internet Explorer and go to “Tools”. Click on the option “Internet Options” from the tools menu.
  • Within the tab “General”, under the section “Temporary Internet Files” (incase of IE6) or “Browsing History” (incase of IE7), click on “Settings” button. Click on the button “Move Folder” under the section “ Temp Internet Files Folder” and in the “Browse For Folder” dialog box, choose the temporary folder that you had created earlier (C:\TempCache).
  • Click on “OK” to finish. Log off your PC and log on again if you are prompted to do so and close all the dialog boxes.
  • Go to “My computer” or “Windows Explorer and delete the existing folder “Temporary Internet Files” and create new folder at the same location and give it the same name.

The folder is normally found at the location “%systemdrive%:\Documents and Settings\user\Local Settings\Temporary Internet Files” incase of Windows XP and at “C:\Users\user\AppData\Local\Microsoft\Windows\Temporary Internet Files” incase of Windows Vista.

  • Repeat the above mentioned steps again and go to “Move Folder” under the section “Temp Internet Files Folder”. From the “Browse For Folder” dialog box, choose the newly created folder “Temporary Internet Files“which is also original but empty.

Solution 3: Access Gmail on a HTTPS Secure Connection

The Browser cache issue is mostly encountered if you try to access your Gmail account on a HTTP connection that is non-secure, i.e. using the addess http://mail.google.com/. It is noticed that the cache error does not show while accessing Gmail through a secure (HTTPS) connection i.e. via the address https://mail.google.com/.

Apart from resolving this browser cache issue, HTTPS URL offers encryption, which takes care of the security and safety of your emails. Therefore it is recommended that you access your Gmail account using HTTPS URL.

Resolve Error While Pinning Programs To Windows 7 Taskbar

Resolve the Issue Related To Error In Pinning Programs To Windows 7 Taskbar

Windows 7 allows you to pin programs and shortcuts to the Taskbar. However, occasionally you might get an error while trying to drag and drop a program to the Taskbar/ Start Menu.The program icon will show a red colored cross while you try to drop it onto the Taskbar/ Start Menu.

Moreover, if you right-click on the icon, you will notice that the options for pinning programs to Taskbar/ Start Menu are missing. As another effect of this error, you may not get any Jump List on right-clicking an icon in the Taskbar.

You will generally get this error in Windows 7 if you have used a registry trick and removed the registry key “IsShortcut” from the system registry in order to remove the shortcut arrow from the icons.

To resolve this issue you simply need to go to the Registry Editor and add the registry key “IsShortcut” back to the extension “.lnk” (also to other extensions if necessary) to restore or reset the registry values back to the original state.

However, if you wish to remove the shortcut arrows from the icons and still pin them to Windows 7 Taskbar, you need to use a different technique.

Fixing HP Installer Plug-In And Uninstaller That Has Stopped Working Giving Error Messages

Fixing HP Installer Plug-In And Uninstaller That Has Stopped Working Giving Error Messages

When trying to install or maybe uninstall HP printing as well as scanning software, or getting driver for printer of HP, scanner or any other imaging devices, an error message may be displayed. The process installation or uninstallation of HP program will automatically stop and cannot continue further or finish.

  1. HP Installer Plug-in Option has stopped working.
  2. Due to a problem, the program was stopped working correctly. If there is solution present for that problem then Windows will shutdown the program and it will notify about the available solution.
  3. The attributes which are extended are inconsistent.
  4. Installer/Uninstaller of HP has stopped working.
  5. Installer Recovery plug-in of HP has stopped working.

In order to resolve this problem for the smooth running of this software as to avoid installation or un-installation problems with HP software suite, the user will have to uninstall IE8 browser. After that, the user should restart the computer so that the desired changes can take place.

The order worsens off internet-explorer did not give any such problem was running the HP software. We should be expecting an update patch very soon on this.

Setting To Hide, Suppress Or Remove #DIV/0! Error In Microsoft Office Excel

Setting To Hide, Suppress Or Remove #DIV/0! Error In Microsoft Office Excel

In the Microsoft Office Excel spreadsheet program or Microsoft Excel, when you divide any value by zero (0) or else a blank cell inside the procedure, the cell will shows the answer which displays an error value #DIV/0!, as the answer of the computation.

The error value possibly will present weird feelings to readers particularly whilst the manual or worksheet is still in groundwork. It is also very awkward when you get the “#DIV/0!” mistake value when some formula is applied to several cells by copying and dragging.

This error value is takes place as it is incapable of dividing any value by 0. On the other hand, it’s likely to get rid of or take out the #DIV/0! Error value in the cell intended for unconfirmed or unacceptable dissection method with using IF worksheet utility.

To restrain or suppress #DIV/0 error value or for preventing the error from showing whenever it takes place. Apply the next formula on behalf of the normal division formula:


The term “Numerator” stands for the number which is to be divided, and the “Denominator” stands for the divisor.

Such as, for rule of “A1/A2? (cell A1 divided by cell A2), the rule to go through into the answer cell is like given below:


The rule ensures to make out if the denominator is equal to zero (or is blank). Therefore, an empty unit is exhibited. If not, the unit that encloses the utility will exhibit the result of the rule term after the calculations.


In order to view other data in the unit if the divisor is empty or zero, enter the essential data in the rule everywhere, which is inside the quotation marks (“”). If you would like to show text, enter it in between these quotes. If you would like to show something else (values), you could enter the values in place of the quotes.

There is another IF worksheet formula which can be operated by using the “ISERROR” situation.

Following is the syntax designed for the formula bit is:


Such as,


Over here again, to exhibit extra information lying on the units, if the computation answer is wrong, then alter the value of the core limit (text string needs quotes).

After entering the mistake treatment method as per the instructions given above, you can drag in order to apply the rule to affect to other cells, and the created rule will automatically be applied to them as well.

Solution For Wmploc.Dll Incompatible Version Error On Windows Media Player

Solution For Wmploc.Dll Incompatible Version Error On Windows Media Player

Executing or Opening different version of Windows media player such as WMP10, wmp11 and wmp12 results in an error associated with the wmploc.dll file.

An error displaying incompatible version is shown below:

The wmploc.dll file has 12.0.7000.7000 version number in place of 11.0.6002.16489 version number.”

This error depicts that the windows media player is not properly installed. If a user encounter this error then re-installing windows media player is the only option.

A common error displayed while installing a new copy of windows media player is the version error for the system file “wmloc.dll”. Users trying to replace the original “Wmploc.dll” system file in the path “\windows\ssytem32” folder encounter this issue.

The wmploc.dll is a dynamic linked library file which stores GUI, graphical user interface in it. The GUI related resources for windows media player and wmploc.dll allows a user to customize the skin of the player. This can be done as the graphic resources can be substituted with a customized design to modify a user interface.

Windows media player validates the version number for wmploc.dll file each time it is started. Error message appears if the version of WMP and wpmloc.dll are different. The version number of both WMP and wmploc.dll file should be same, if the media player is to work properly.

A solution to fix this problem is to substitute back the original file. If this does not solve the problem then a user has to reinstall the player again.

Users who are interested in retaining a customized wmploc.dll file of a different version have to follow the steps shown below to solve the incompatibility of version.

Step by step guide to solve incompatible version error.

  • Download Resource hacker and complete installation on the system.
  • Execute resource hacker.
  • Open a system file “wmploc.dll” from the %windir%\system32\ folder.
  • Elaborate the tree with resources located on the left side of the pane. Browse and select the below branch:

version info ->1 ->1033 [If the operating system version is non-English, then a different number will be displayed]

version info -> 1 -> English (u. s) [The language displayed can be different]

  • Modify all illustrations of version numbers with the right WMP admitted version in the right window. An example validating an error in system file “wmploc.dll” is either invalid or wrong. Numbers 12, 0, 7000, 7000 & 12.0.7000.7000 present in the dll will be substituted with numbers 11, 0, 6002, 16489 & 11.0.6002.16489.
  • The illustrations that can be modified are fileversion and productversion. Only the beginning portion of the file version’s build-tag will be modified.

  • Select by clicking compile script button after changing the versions. Now save the changes made in the file.
  • Execute windows media player again.