Unable to save projects in Jupyter Notebook

I am a beginner so I wanted to install for the first time this application. I get errors when I try to save a project. In the top right, when I open the projects it says kernel error. If I try to save it, I get Unexpected error while saving file: Documents/Python/Python - 1.ipynb [Errno 2] No such file or directory: ‘C:\Users\Catalin\Documents\Python\.~Python - 1.ipynb’
Any help? I have never programmed in python before.

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