Why does it give these errors when compiling the game in Unity?

Question

Unity

When compiling, it gives the following errors:

spoiler

Unhandled exception. System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
UnityEditor.BuildPlayerWindow:BuildPlayerAndRun ()

Необработанное исключение. System.Reflection.TargetInvocationException: исключение было выброшено целью вызова.
UnityEditor.BuildPlayerWindow: BuildPlayerAndRun ()

spoiler

---> System.IO.DirectoryNotFoundException: Could not find a part of the path 'D:\Project\Just-Tanks\Library\ScriptAssemblies\Assembly-CSharp.dll'.
UnityEditor.BuildPlayerWindow:BuildPlayerAndRun ()

---> System.IO.DirectoryNotFoundException: не удалось найти часть пути 'D: \ Project \ Just-Tanks \ Library \ ScriptAssemblies \ Assembly-CSharp.dll'.
UnityEditor.BuildPlayerWindow: BuildPlayerAndRun ()

spoiler

at System.IO.FileStream.ValidateFileHandle(SafeFileHandle fileHandle)
UnityEditor.BuildPlayerWindow:BuildPlayerAndRun ()

spoiler

И другие:

I created a clean project, there is no such error.
I created a copy of my project, there is an error, I deleted all the elements (I left only a new scene), there is an error.
I created a new project, transferred everything from Asset to the project, it works.
Then what's the problem, why the old project does not compile?

Answer 1

Chrome + F12 + Network
Fiddler