Follow along with the video below to see how to install our site as a web app on your home screen.
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How do I? And what's this message mean?
They are probably the only ones that know what that message means. My guess is they will tell you to delete the game completely, and re-install.
And start campaign all over again? :/
Do you have your saves uploaded to the PS4 cloud? If so, you should be good there. If not, turn that on first.