RsaCtfTool.py - private.pem: Permission denied code example

Example: ./RsaCtfTool.py: command not found kali linux

git clone https://github.com/Ganapati/RsaCtfTool.git
sudo apt-get install libgmp3-dev libmpc-dev
pip3 install -r "requirements.txt"
python3 RsaCtfTool.py