Copying Assembly from temp to Library/ScriptAssemblies failed.

Copying assembly from 'Temp/Assembly-CSharp.dll' to 'Library/ScriptAssemblies/Assembly-CSharp.dll' failed

This error is appearing in a completely new project, before I have made any changes. This is the error I keep receiving in the Unity Editor. I have updated Unity to the latest version - 2019.1.9.f1. I am unable to use Unity because of this error. Based on other threads talking about this topic, I have tried their suggestions like :

1. "Reimporting all scripts".
2. Clearing the "Temp" folder.
3. "Reset packages to default" option.
4. Made exceptions in the antivirus. Also tried by removing the antivirus completely.
5. Made changes to the project and saved it. Then reopened the project, but the error was still there.

All these suggestions could not help me solve the error. I am unable to build anything. My projects have come to a standstill.

I am a bit desperate, and would appreciate any help in this matter.

 

Here is the error. The project is fresh.

 

Happens the Copying assembly failed error to me also, but with different assemblies, there is no way to make a build that works