Are you hand editing?
In every case this has happened to me, it has been becuase I screwed up hand editing a file. I'm not sure how forgiving the UI Builder is, as I don't use it. But if you have been hand editing files, then you'll have the tedious process of going back to see what you can find. Some of my common mistakes are separating numbers with periods instead of commas, leaving off a closing quote. This can alos be cuased by deleting interface elements that the code is hard coded to look for.
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