I am using PyRx as platform when I load macromolecule and ligand, the molecules get loaded. When I Dock I get this message ">Python 2.6.5 (r265:79096, Mar 19 2010, 21:48:26)"
You may want to try this. Fetch a new version of PyRx. Uninstall the old and reinstall with the new. Again, you can also try it on a different system. See these links too for similar complaints.
https://sourceforge.net/p/pyrx/tickets/56/
https://sourceforge.net/p/pyrx/tickets/28/
You may also want to contact the owner of PyRx https://www.researchgate.net/profile/Sargis-Dallakyan