I have seen this message before as well. If you find it necessary to isolate the issue, then do so and report a bug. If it helps, I am on Windows 7 64 bit with Java 6 and have absolutely no clue what kind of code will reproduce the message.
This problem happens when I run a sketch with 2 monitor connected, then, if for some reason I unplug a monitor and I run a sketch, I've this message, cause the IDE expect to find a monitor that was there before.
Restart the IDE solve the problem.
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