It is very easy to get “Copying assembly from directory Temp to Library/ScriptAssemblies failed” error when change the c# code.
I have to relaunch the editor to fix this. I am using 2018.2 beta with the new package manager and dotnet 4.x~
That’s a known issue with the Incremental Compiler. It’s being worked on, but there’s no fix right now.
Instead of closing Unity, you can try and reimport a cs or asmdef file, to trigger another recompilation. It should work (that’s what I do).
I am not using the Incremental Compiler, at least I do not install it in package manager.
I am using the Unity2018.2b8.
There are packages that depend on it and will install it automatically.
Do you have a “Compiler” section in your editor preferences (Edit → Preferences)? If it’s there, the compiler was installed by something else (maybe the entities packages).
If it’s not there, this might be something else. Maybe submit a bug report and paste the # back here so the devs can take a look.
No, there is no Compiler page in perferences.
Oh, that’s new!
Could you submit a bug report with a repro project?
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As @SugoiDev requested, it would be great if you could submit a bug report with a minimal reproduction case for this issue. We were not able to reproduce this behaviour by your description alone.