C-Sharp (C#) Group: Debugger doesn't work

I don't know why the debugger doesn't works, when I press
F5 on my
project  in visual studio 2005 it shows me this message

ERROR WHILE TRYING TO RUN DE PROJETCT
THE LINK IDENTIFIER IS NOT VALID!

I really don't know what to do, I'll apreciate any help,
thanks you
all!


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