Netbeans is not opening

I have netbeans 6.8.

I wanted to install jax-rpc plugin and added this link to my plugin finder.

http://deadlock.netbeans.org/hudson/job/nbms-and-javadoc/lastStableBuild/artifact/nbbuild/nbms/updates.xml.gz

I also did something weird.. i think i did check for updates every startup or everyday.

and now it is showing all these errors and not opening up:

Warning - could not install some modules: Bootstrap - The module name   
org.openide.util.lookup was needed and not found. Upgrade - None of the modules  
providing the capability org.openide.modules.ModuleFormat1 could be installed.  
Upgrade  - The module named org.openide.util.lookup was needed and not found. File 
System API - None of the modules providing the capability 
org.openide.modules.ModuleFormat1 could be installed. Module System API - The module   
named org.openide.util.lookup was needed and not found. Startup - None of the modules 
providing the capability org.openide.modules.ModuleFormat1 could be install开发者_如何学编程ed. 3 
further modules could not be installed due to the above problems.

And two options "Disable Modules and continue." and "exit".

Pressing anyone closes the ide. Also last time when ide was working and installed that plugin it was validating other plugins and i exited during that part.

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You could try deleting the NetBeans cache. On my platform it's in my home directory, ~/.netbeans/7.0/var/cache.

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There is a subdirectory "backup" in your .netbeans/7.x/update directory. It contains (in my case at least) the files shown in the picture:

Just copy them back into the .netbeans/7.x directory, merging and replacing existing files and directories. After doing that, I could start netbeans normally without reinstalling and losing all my addons and preferences.