As Marco told the other guy you should open a support ticket if you can... for some reason your userid counter has reached the maximum allowed value but since you obviously don't have 4 billion users something went wrong... You (or someone qualified) will need to manually look at your users table in the database and see where your user id's jumped from normal values to the billions... The auto increment will need to be reset to the lower, correct value... Higher user ids, if they exist may have to be changed or deleted. How many users does your forum report you as having?
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