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I just installed NB5.0b2, while still having NB4.1 installed in a different directory. I imported my NB4.1 settings, and upon startup of NB5.0b2 (not just first startup, but further startups as well), I get an error pop-up: A java.lang.RuntimeException exception has occurred. Please report this (here) including a copy of your messages.log file as an attachment.
Created attachment 28218 [details] messages.log
Thanks for report, reassigned to java team to evaluation.
*** This issue has been marked as a duplicate of 63596 ***