Failed assemblies stripper (472239)

I’m having an issue when I set mscore micro lib or whatever it’s called. Can anyone help me find a hint in the error log?

UnityException: Failed assemblies stripper: /Applications/Unity/Unity.app/Contents/Frameworks/Mono/bin/mono “/Applications/Unity/Unity.app/Contents/Frameworks/Tools/UnusedBytecodeStripper/UnusedBytecodeStripper.exe” -l none -c link -a “Assembly-CSharp-firstpass.dll” -a “Assembly-CSharp.dll” -a “Assembly-UnityScript-firstpass.dll” -a “Assembly-UnityScript.dll” -out output -x “/Applications/Unity/Unity.app/Contents/Frameworks/Tools/UnusedBytecodeStripper/link.xml” -d “Temp/StagingArea/Data/Managed” -x “tmplink.xml” current dir : Temp/StagingArea/Data/Managed
result file exists: False
stdout:
stderr: Unhandled Exception: Mono.Linker.ResolutionException: Can not resolve reference: System.Reflection.Emit.OpCode System.Reflection.Emit.OpCodes::Ldind_I1 at Mono.Linker.Steps.MarkStep.MarkField (Mono.Cecil.FieldReference reference, System.Object markedby) [0x00000] in :0 at Mono.Linker.Steps.MarkStep.MarkInstruction (Mono.Cecil.Cil.Instruction instruction, Mono.Cecil.MethodDefinition markedby) [0x00000] in :0 at Mono.Linker.Steps.MarkStep.MarkMethodBody (Mono.Cecil.Cil.MethodBody body) [0x00000] in :0 at Mono.Linker.Steps.MarkStep.ProcessMethod (Mono.Cecil.MethodDefinition method) [0x00000] in :0 at Mono.Linker.Steps.MarkStep.ProcessQueue () [0x00000] in :0 at Mono.Linker.Steps.MarkStep.Process () [0x00000] in :0 at Mono.Linker.Steps.MarkStep.Process (Mono.Linker.LinkContext context) [0x00000] in :0 at Mono.Linker.Pipeline.Process (Mono.Linker.LinkContext context) [0x00000] in :0 at UnusedBytecodeStripper.Program.Main (System.String[ ] args) [0x00000] in :0

UnityEditor.MonoProcessUtility.RunMonoProcess (System.Diagnostics.Process process, System.String name, System.String resultingFile)
UnityEditor.MonoAssemblyStripping.MonoLink (BuildTarget buildTarget, System.String managedLibrariesDirectory, System.String[ ] input, System.String[ ] allAssemblies, UnityEditor.RuntimeClassRegistry usedClasses)
UnityEditor.BuildPlayerWindow:BuildPlayerAndRun()

Seems like you are using some of the dot net stuff that is not supported with micro mscorlib.