I was having difficulty syncing my gateway app to my Marshall.com to add downloaded presets to my library. On the forums Marshal suggested doing a factory reset by holding the amp button down while restarting the amp. 
I did that. Now when I try to Bluetooth connect the gateway app and the amp I get this an error that says "connection rejected. You may only control amps you are already connected to for audio output". 
I have restarted the amp and phone but I keep getting the same error message. 

please advise on both this current problem as well as how to sync my gateway so that the downloaded presets get added to my gateway library.