This is a generic screen resolution error. Please confirm that your host PC can support the resolution you are requesting from the client computer. If this happens, you can try going to your settings tab and choosing "Keep Host Resolution."
If you're on Linux or on the Raspberry Pi, please either launch Parsec with these settings:
You can either place those in your config or launch Parsec by typing this into the cli: parsec server_resolution_x=-1:server_resolution_y=-1
If you then get a 15000 error, your computer doesn't have the capability to host either because you need a driver update, or your hardware is not supported as a host.