If the error allows you to click "Cancel" or "Revert" to enter the game:
Finding yourself staring at an error message that says when trying to launch Resident Evil 4 Remake can be incredibly frustrating, especially if you’re eager to jump back into the action on your Mac, iPhone, or iPad. This issue typically occurs because the game requires an active iCloud connection to manage cross-platform save data and verify ownership.
If Error 100 is present, the system account sync needs a refresh.