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I've experienced this error message and inability to play my games as well.

I managed to solve it (for now at least) by going into the app installation location on my machine and running the updater.exe file that is in there. There was an update available that the app was not downloading on its own. Once the update was installed I gained access to my games again.

I don't know why there isn't an option to tell the app to check for updates manually since it clearly doesn't seem to be able to do it correctly on its own.