I've been getting this on a few devices for the past few days and have done LOADS of searching and tried numerous listed and suggested solutions to resolve this error. Including removing and re-adding google account, clearing cache and data on Google Play Services and Google Play store. Restoring a previous backup of the Playstore etc. but nothing has worked.
Seems I'm not alone. Here are some recent search results you can paruse if you feel like it.
Just this evening I logged into the Play Store via the Web on a PC and went to 'My Applicatins' in the Play Store and get an error there too!!
Supposedly Google is aware of this and is 'working on it' but since they are notorious hard to get any real information from I doubt we'll get an update until it 'just works'.
Though I'd put this out for others in the same boat.