My Project doesn't have any errors while running. However when I build (IL2CPP) I get some errors: Failed running C:\Program Files\Unity 2018\Editor\Data\il2cpp/build/il2cpp.exe ... Exception: C:\Program Files\Unity 2018\Editor\Data\il2cpp/build/il2cpp.exe did not run properly! Build completed with a result of 'Succeeded' (???) and then... Copying assembly from 'Temp/Unity.TextMeshPro.dll' to 'Library/ScriptAssemblies/Unity.TextMeshPro.dll' failed I googled for this issue, but nothing works. Don't really know what to do, seems like a bug, nothing wrong with my code. EDIT: Same problem with Unity 2018.2.5 and 2018.2.6 EDIT 2: The error "Copying assembly from 'Temp/Unity.TextMeshPro.dll ..." goes away after a restart. Also, it "showed up" in a Mono build too. Since the project built an apk successfully with Mono, the problem has nothing to do with TextMesh Pro. Most probably its caused by another plugin. Maybe this post should be deleted.