Try switching off your device then on again or switching your data or wifi on and off again, I sometimes get it too
Worst comes to worst, you can remove the data cache for the app.
NOTE: before doing this make sure you log-in and sign-in to your google/apple play account.
Tried this sometimes it works sometimes it doesn’t.
I removed cache. Haven’t yet removed the app and reinstalled… it may come to that.
Hubby was getting that error last night when trying to attack in wars. There was a certain opponent that he could not attack. Period. Mine was fine in wars, but I got that in raids.
Hopefully, resetting your device will help your problem. It didn’t ours 
Not sure if it was a server error or a cell service error (We switched off wifi in case that was the problem).
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