If you are collecting large numbers with attributes on an event registration form (such as a phone number) and the attribute type in RE is "Number" then you need to create a new attribute with a type of "Text" and replace the number attribute on your form. This error is occurring because RE is reading the phone number as a very large number (if there is an area code, then you have a number with a billions place in it) and the number is over the limit for RE.

The current event registration will need to be manually entered into The Raiser's Edge.