fatal-error-c1197.md

description	title	ms.date	f1_keywords	helpviewer_keywords	ms.assetid
Learn more about: Fatal Error C1197	Fatal Error C1197	11/04/2016	C1197	C1197	22b801b7-e792-41f6-a461-973c03c69f25

Fatal Error C1197

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"