'why am i getting error massage of, "NO USABLE PYTHON FOUND" when python 3.8 is already installed

When writing the below code in Ubuntu Terminal

./setup.sh --install

I am getting the below error message

No Usable python found. Please make sure to have python 3.6 or python 3.7 installed.

However, Python 3.8 is already installed in the system.



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