Manimgl does not find the imports.

Hi guys I need your help. I have cloned the repo to rebuild the videos. Unfortunately I have several problems. In various instructions I was told to copy the file to be executed to the root directory of the git. I have done that. After that I started the Python file with Manim. It came to an error message, this can be seen in the picture. It means that it cannot find the file manim_imports_ext. This is demonstrably there. Can you help me to solve the problem?

Thanks in advance.