Unable to run the command line extension with 6.x RTC

Hello,

I ran the steps mentioned at https://github.com/rtcTo/rtc2gitcli/wiki/Setup but I get the following error while running the launch configuration rtc2git

Error:
Problem running 'help':
Unknown subcommand "migrate-to-git". Try 'scm help' for more information.

Any pointers for me to proceed?