Darn, that sounds like a version mismatch, but if you definitely have the right version then I'm not sure. My advice:
1) be *absolutely sure* that the mod file is named "Assembly-CSharp" with the file extension ".dll"
2) make sure you leave "Assembly-CSharp-firstpass.dll" in place
3) try starting over with a clean install of the game
Good luck!
nianeyna
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