Great, now eclipse doesn't want to start :(

[Andres Gonzalez]

I was trying to install a plugin when all of the sudden eclipse crashed. the error is:

!MESSAGE Exception launching the Eclipse Platform:
!STACK
java.lang.reflect.InvocationTargetException: java.lang.IllegalArgumentException: Application not found: org.eclipse.ui.workbench.
at org.eclipse.core.internal.boot.InternalBootLoader.run(InternalBootLoader.java:843)
at org.eclipse.core.boot.BootLoader.run(BootLoader.java:461)
at java.lang.reflect.Method.invoke(Native Method)
at org.eclipse.core.launcher.Main.basicRun(Main.java:291)
at org.eclipse.core.launcher.Main.run(Main.java:747)
at org.eclipse.core.launcher.Main.main(Main.java:583)

I read on the web that one of the solutions was to delete the .metadata directory in my workspace, but if I delete it, alllllll my settings I lost (3 days setting up eclipse to work in CVS, Countless hours getting ant to run, etc..).
Any Idea on how to solve this issue?

[Matthew Phillips]

You can try removing the plugin from the plugins folder and then removing the folder for the plugin in the .metadata/.plugin folder. I have done that with a plugin and had it work without deleting the rest of my settings.