This morning my Samsung Galaxy Tab S2 told me a system update, to Nougat, was ready for installation. After installing it Calendar gave an error. No problem, let's see if there's an update. The Play app only gave a blank screen, also Gmail didn't want to download new emails.
I was already envisioning a factory reset. But after a quick Google search I found that it's a common problem and the solution for my tablet was to boot it in safe mode, start Play, close it, reboot. And then everything worked as it should.
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