Do you have a way of replicating this? I tried like you described but unfortunately it does not happen for me.
This is a bit of a generic error, you might come across it if you try sending a command or operation, and the data you were working on was no longer valid. For example if the page was open for too long, and the items on screen changed (ie. some phone IP may have changed, or they became unregistered, or simply something timed out).
A page refresh should allow you to resume whatever you were doing though in this case.