Eclipse missing action Set

I have a problem while opening Eclipse. In the error log it says:

unable to find action set org.eclipse.wb.core.ui.actionset 
       org.eclipse.rse.core.search.searchActionSet
       org.eclipse.rse.core.search.searchActionSet
       org.eclipse.mylyn.doc.actionSet
       org.eclipse.mylyn.context.ui.actionSet

I'm using Eclipse juno(version 4.2) and my ADT is version20 and Java 1.6 Do you have any idea what I am supposed to do?