A q session requires that when it binds to a network port that the port is free and unused. From the error it looks like another application is already listening on the port you requested (8099).
You can ascertain the process id of the application using netstat or similar tool. The error you are getting is a Windows error so using netstat -a -n -o | find "8099" will let you find the process currently running on that port.
You must either kill this process or move your q session to a different port.