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Compiler Error CS0656

Missing compiler required member 'object.member'

One of the following problems exists:

  • Your installation of the common language runtime is corrupt.
  • You have a reference to an assembly that defines a type that is also found in the common language runtime. However, your assembly's type is not defined the way the C# compiler expects.

Check your references to ensure that you are using the correct version of the common language runtime.