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Question by Summy_99 · Aug 31, 2020 at 10:39 PM · errorassemblyassemblies

Error: "Copying assembly from 'Temp/UnityEngine.TestRunner.dll' to 'Library/ScriptAssemblies/UnityEngine.TestRunner.dll' failed"

I have found other posts with this (or similar) issue, but none have had solutions that worked for me.

Whenever opening a project in Unity 2020.1.3f1 (including brand new projects), I get the following error message immediately: "Copying assembly from 'Temp/UnityEngine.TestRunner.dll' to 'Library/ScriptAssemblies/UnityEngine.TestRunner.dll' failed"

Sometimes I get another one with it that is the same thing just with UnityEngine.UI.dll instead. Whenever I create a script, I get "Copying assembly from 'Temp/Assembly-CSharp.dll' to 'Library/ScriptAssemblies/Assembly-CSharp.dll' failed"

At least one of the errors on startup has occurred on every single launch and the script error has occurred every single time I've created a script.

I am running on Windows 10, and this is my first time trying to use Unity.

Things I have tried that have not worked:

-Restarting Unity (many, many times)

-Reinstalling Unity (a couple times)

-Installing an older version of Unity (2019.4.9f1)

-Disabling Antivirus software (I just have Windows Defender)

-Scanning for malware

-Reimporting pretty much everything

I am at a total loss here and in desperate need of assistance, I need this software for a class I am taking. Please help.

Update: I found I had a failing RAM stick, but even with it removed, I'm still getting these errors

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Answer by eprtr2029 · Apr 11 at 01:24 PM

Like you, I have tried many methods and still haven't solved this problem.

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