What causes "mt.exe : genman error Gc1010032: Failed to open scope on file"?

Question

We run mt.exe on some of our .NET DLLs during our build. We just started getting the following error message:

mt.exe : genman error Gc1010032: Failed to open scope on file

The command being executed is:

mt.exe -managedassemblyname:"path\to\some.dll" -nodependency -nologo -out:"some.dll.manifest"

I cannot find any meaningful references either to error code "Gc1010032" nor the term "Failed to open scope on file" at all. What does this mean?

Answer 1

This extremely confusing error message apparently just meant that the DLL file was not found.

This was because of a change made to switch from compiling the DLL from AnyCPU to x86 (for reasons) and Visual Studio changed the default output location from bin\Release to bin\x86\Release.

I've added this answer just because the error code & message were so obscure.