Debugging of my app is now suddenly broken. It has been fine up to now and I even reloaded a known good version of my entire code and it still fails to debug or even run.
Please see the correct annswer HERE
You have set a break point in one of the classes. Just take off all the break points in your project and run again, their will be no problem.
Eclipse->Window->Show View->(Other->Debug->)Breakpoints