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Question by ciaratamay · Nov 01, 2019 at 06:42 PM · editorprojectassemblyinstallassemblies

Copying assembly from 'Temp/UnityEngine.TestRunner.dll' to 'Library/ScriptAssemblies/UnityEngine.TestRunner.dll' failed - corrupting all my projects, tried all other q answers

A few days ago I switched from editing a script in Visual Studio back to Unity (2019.2.10), using HDRP which crashed Unity - when I opened the project again, only a few items in my scene were visible at all, with pink error materials, most items were not visible in the scene and all references to any scripts showed missing script / not monobehaviour.

In the console, I have these two errors:

Copying assembly from 'Temp/UnityEngine.UI.dll' to 'Library/ScriptAssemblies/UnityEngine.UI.dll' failed

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



I tried reinstalling unity, installing a newer version (unity 2019.2.10 to 2019.2.11, also tried with latest Beta) and have same issue and errors with the project folder. I have a backup folder from a week ago, which when I open it on the same PC results in the same error - I also see that the \Library\ScriptAssemblies folder becomes empty after being opened in unity on this PC. I've tried copy pasting everything from that folder back in after opening, no change.



I opened the backup folder on a different PC with 2019.2.11 and was able to open it as normal - however the folder that appears to have been corrupted on the other PC results in the same issue on either PC.

It appears that opening any of my projects (pre-crash and post-crash) results in them being irretrievably corrupted on my main desktop - my other laptop can run a pre-crash project no problem, but that laptop is not good enough to run VR, so I can't use it for developing this project.

I've tried all of the fixes provided by other users here: Nothing works at all:

  • I have already uninstalled and deleted both versions of Unity, deleted everything unity or unity technlogies in my AppData folder, also deleted a ton of keys under unity or unity technlogies in registry.

  • tried reimporting all assets, resetting packages to default

  • I have also tried disabling antivirus, scanning for viruses, (found a bit miner but still having same problem)

  • ensuring I have full admin control of the folders in my project

  • deleting temp folders

  • starting a new project and importing a custom package that I exported which included most of the assets in my project, (scripts, scene, models, prefabs)- importing the asset package causes the same issue (on my desktop, not on my laptop.)

  • opening visual studio and editing a script then going back to unity, no change.

  • I'm not using collaborate or multiplayer package.

  • The problem never goes away by restarting unity

  • List item



My next option is to reinstall windows, but as I seem to have removed unity fully already I don't know will this definitely fix things - if anyone has any other solutions please help! I have filed a bug report also.

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avatar image Propagant · Mar 28, 2020 at 03:20 PM 0
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Still no solution? Same issue Unity 2019.2.4f1...

avatar image ciaratamay Propagant · Mar 28, 2020 at 03:32 PM 1
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Unfortunately never got a solution. I reinstalled windows and then returned to work on my older version of the project, never had the same problem since and just made sure to always have separate backups. Received a response from unity weeks later looking for more information but I had to submit my master's project and had no more time to wait or investigate.

avatar image Propagant ciaratamay · Mar 28, 2020 at 04:21 PM 0
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Hey thanks for respond. The problem occurs when I try to import any external asset from assets store. That's really strange. Also I found some $$anonymous$$ers but the problem remains... Really annoying. Will post you a solution here if I got some

avatar image udaypeddinti · Jul 27, 2021 at 01:29 PM 0
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After importing assets ,save the file and close unity editor ,then delete the library folder of your project ,now open the project ,you will not find the error

thank you

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Answer by udaypeddinti · Jul 21, 2021 at 09:43 AM

An infinite import loop has been detected. The following Assets were imported multiple times, but no changes to them have been detected. Please check if any custom code is trying to import them. please someone help me to get out of this . i have started a new project in that just if i add burst package or post processing then i am getting the above mentioned error

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avatar image ciaratamay · Jul 27, 2021 at 01:37 PM 0
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I don't think this is related. You'd be best asking a new question

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