That error doesn't have anything to do with how you're using Counterparty; it's a problem with pycoin.
Try changing the version of pycoin required (in reqs.txt) to 0.25 and then rebuilding from source again.
Yeah, apologies. I had updated the pycoin dep version on develop, but not master branch. Phantom got it updated on master...so we should be good.
Is the current Master branch built updated as the develop branch ? I am currently running the develop branch but are seeing some issues with issuances. So I am not sure if this is just something with my develop build or something else