See in your task manager that any server is running with same port. If it is running with the same port you will get this message. May be if you install oracle on your system the server will run on same port.
Check in your task manager that any server are running with same port.Do end process for that server and go with OpenSTA.
I didnot install oracle in my system nor any software is running on port 81.When i try to create new script in commander am getting a message "Delete browser backup file". If i get this message iam running into the gateway problem.I dont know what should i do when i get this message? I have attached screenshot.
Also i can see by netstat -an command port 81 is listening and in taskmanager gateway.exe is running eventhough i stopped recording.