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Fatal Error C1197

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cannot reference 'mscorlib.dll_1' as the program has already referenced 'mscorlib.dll_2'

The compiler is matched to a version of the common language runtime. However, an attempt was made to reference a version of a common language runtime file from a previous version.

To resolve this error, only reference files from the version of the common language runtime that shipped with the version of Visual C++ you are compiling with.

Example

The following sample generates C1197:

// C1197.cpp
// compile with: /clr /c
// processor: x86
#using "C:\Windows\Microsoft.NET\Framework\v1.1.4322\mscorlib.dll"   // C1197
// try the following line instead
// #using "mscorlib.dll"