Basically, I've noticed that when the project is wrapped up as a Cordova export, using the browser 'close' command will minimise the Cordova game. I can still see it when I use the Android square button to see what apps are open in the background.
When I then try to open it again, it gives me that error.
I'm not doing anything differently and everything functions ok on web etc.
No really sure what this means or whether there is another method I should use.
Thank you :)