Question Infinity Error "Copying Assembly failed, xxxx.dll does not exist"

error message:

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

Detailed error: Library/ScriptAssemblies/UnityEngine.TestRunner.dll does not exist

i open the Temp folder of my project and the .dll which the message said is just there

i was trying on this error about a month
googled and still stuck on this

for the CSharp.dll
i can reimport any C# script to resolve it

so i tried it on other .dll error
sometimes it will change to another .dll
e.g.: TestRunner.dll > UI.dll

the other way i googled is copy the .dll manually
they said the file will inside the folder which located at
Unity\Editor\Data\UnityExtensions\Unity\GUISystem\Editor
but i didnt saw any UnityExtensions folder in my computer
i ended up with
Unity\2020.3.24f1\Editor\Data\Resources\PackageManager\ProjectTemplates\libcache\com.unity.template.universal-10.7.0\ScriptAssemblies
then i copied the .dll to my project, nothing happened
if i re-open/reimport the project, the Library/ScriptAssemblies folder will be blank

some said the anti-malware software may block the accessment of the files
i had set the Unity folder to whitelist of my IObit

i tried to use other editor version
i just re-install Unity and nothing change

even a blank new project will error too
i have no idea how to fix it