the located assembly's manifest definition does not match the assembly reference. (exception from hresult: 0x80131040)
The .NET Assembly loader:
is unable to find 1.2.0.203
but did find a 1.2.0.200
This assembly does not match what was requested and therefore you get this error.
In simple words, it can't find the assembly that was referenced. Make sure it can find the right assembly by putting it in the GAC or in the application path. Also see https://docs.microsoft.com/archive/blogs/junfeng/the-located-assemblys-manifest-definition-with-name-xxx-dll-does-not-match-the-assembly-reference.