vimpdb does not accept commands

[stdcerr]

I installed vimpdb with pip and after that it gave me the error described here, I also cloned the repository from (https://github.com/gotcha/vimpdb) and used the easy_install method but it keeps giving me the same troubles:

When I get to a breakpoint (vimpdb.set_trace()) I see the screen showing the source code with the cursor sitting at the right position but any time I try to enter commands as indexed on https://github.com/gotcha/vimpdb#vim-commands , for example :PDBStep, I get an error E117: Unknown function: PDBSendCommand while autocomplete (for :PDBStep) seems to work fine. I'm obviously missing something (PDBSendCommand)but am not sure how get it setup correctly? Can you help?

[gotcha]

Are you using it with Python 2.7 ? Python 3 is not supported.

[stdcerr]

Are you using it with Python 2.7 ? Python 3 is not supported.

Thank you, while this is helpful information, I have ,moved past this by now and can not go bac to check, however, the system did use some combination of 2.7 & 3. I believe this will be helpful for others.
Thank you!