score:2
You will normally get this sort of error when a ModuleBuilder has already been 'compiled', or a TypeBuilder has already been 'compiled'.
I would check where such things happen. Also, a stack trace may be handy in this case.
score:-1
There is a bug report here, not sure though if it is the same issue that you experience. Apparently this has been fixed in .NET 3.5 SP1.
Source: stackoverflow.com
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