Follow the below steps:
1) From the help window see if your Polyspace license is correctly activated. If the activation is done, you should be seeing something similar as below in the "Help-> About":
2) Hostname and Port number should match the server being used. Ensure you have given the right server name (check with your IT team for this purpose if you work in a org).
3) Try running Bug Finder (this doesnt need the servername or port configuration). Do the below config changes..