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I have two projects open where MK2 is the one I'm currently working in and MK1 is the previous version that I use as reference when coding in MK2. As I'm improving code from MK1, I normally use the same class names although the improved ones are located in MK2. There's no connection between MK1 and MK2 that I'm aware of. It happens quite frequently that the debugger choose classes from MK1 which causes exceptions. I've seen many similar bug reports which are closed, but it seems the problem is still present, or maybe that I've missed some implicit connection between the two projects that I'm not aware of.
This looks like a duplicate of issue #198764. *** This bug has been marked as a duplicate of bug 198764 ***