mutate_bases error

[dnalectronics]

Hello Sir,

Thank you for such a beautiful forum. I want to use mutate_bases to mutate the cytosine base pair. However, it shows this error.

$ mutate_bases -s fiber_model.pdb -m 4 5CM output.pdb
'mutate_bases' is not recognized as an internal or external command,
operable program or batch file.

Please help in understanding why I am getting this error.

Thank you