MLAPI FileNotFoundException directly after installation

Hello everyone, so i’m trying to install MLAPI in a fresh project (2020.3.16f1) and directly after the installation with the Package Manager i get the same Error Message two times:

(0,0): error System.IO.FileNotFoundException:

I followed all the steps from the unity MLAPI documentation: Installed Git, restarted my computer and pasted the Git-Link from the Unity Documentation into the Package Managers “Add package from git URL”-field…
The Package is also NOT labeled as a Preview Package.
But i still keep getting those Error Messages and i don’t even know where to start searching for a solution.

Did anyone experience the same thing or know how to fix it?
Thanks in advanve!

Does your project name or folder path contain any special characters (including spaces)? If yes removing them should fix the issue.