Data Is Corrupt, And Client Refuses To Open

As the title says, I have gotten the "Data is corrupt." Error message, usually, this wouldn't be an issue, I'd just press 'OK', or the X and move on with my life, but, every time I do so, the error message just pops up again. I've attempted reinstalling the game, multiple times, and the issue still persists. If anyone has dealt with this in the past, I would appreciate any answers anyone could give.