create_service command git error

[ghost]

after installing fastapi_serviceutils I try running the following command,

create_service -n exampleservice -p 9999 -a "John Doe" -e john.doe@jdmail.com -ep example -o /Documents 

I get the following error message,

tuncovacik@Tuncs-MacBook-Pro ~ % create_service -n exampleservice -p 9999 -a "John Doe" -e john.doe@jdmail.com -ep example -o /Documents 
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.9/bin/create_service", line 8, in <module>
    sys.exit(main())
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/fastapi_serviceutils/cli/create_service.py", line 107, in main
    filepath = clone(
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/cookiecutter/vcs.py", line 101, in clone
    subprocess.check_output(
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/subprocess.py", line 424, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/subprocess.py", line 528, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '['git', 'clone', 'ssh://git@github.com/skallfass/fastapi_serviceutils_template.git']' returned non-zero exit status 128.

I simply followed up the following guideline
https://fastapi-serviceutils.readthedocs.io/en/latest/exampleservice.html#creating-new-service

could anyone please help resolving this issue?
many thanks