'xxx' is ambiguous in the namespace 'YYY'...
Is an error I had some fun with, because I, of course, thought it was something in the code. But finally (after googling a bit) I looked in my bin directory, where I found a dll-file that contained an old version of 'xxx', which made the 'xxx' visible to the application in two versions.
Upla... yet another example that it is a very good idea to read and understand the error messages.
