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I had the same issue in my case it was no execution permision for python file. To make file executable please go your package/src directory and type

chmod +x your_file.py

You may want to check first if files have execution permision by cmd

ls -la

If file is executable it should have x permision in list like:

rwxrwxrwx

If file is not executable ls -la will display it without x:

rx-rw-r--

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