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Start of the IDE with no projects open, i.e. no project was open on last exit. When loading a project java.lang.NullpointerException occurs. The same happens upon loading another project.
Created attachment 28820 [details] message.log
Somewhere in an NBM project's project.xml you have a <runtime-relative-path> (inside a <class-path-extension>) which is empty; that is illegal. Better error reporting generally covered by existing issues.
*** Issue 72502 has been marked as a duplicate of this issue. ***