Do you see port 32400 open and listening when you run netstat?
If yes, then that means the PMS started successfully.
If no, then that means the PMS failed to start. Try rebooting. If a reboot does not fix the problem, try un-installing the addon, deleting the associated addon and userdata folders for PMS, rebooting, and re-installing the addon.
Also make sure that the addon is a match for your architecture. This addon is meant for 64-bit platforns, not ARM (Raspberry Pi) or Android.
If after the above steps, try reffering to this post on how to further troubleshoot PMS issues.
Raspberry PI. Dang. Thank you for your help!