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[200510231800] I cannot reproduce this issue. I try to describe what I did. I added new Netbeans platfrom in netbeans platfrom manager. After that I created new standalone module project with the new Netbeans platfrom.
Created attachment 26281 [details] exception
Probably just synchronizing an access to the listeners should fix this. I'll fix it.
Fixed. Checking in NbModuleProject.java; 1.117 --> 1.118
the fix looks fine