Gittin 80 - Errors in Get

If one deviated from the rules of a Get, such as being in Babylon, dating it according to the calendar of Rome or Greece, or even dating it from the construction or destruction of the Temple, or incorrectly naming the city of writing, the Get is invalid.

According to Rabbi Meir, the woman must leave her new husband if she re-married but can not return to her previous husband. She also loses her Ketubah payment from both and many other benefits.

However, the prevailing ruling is that she does need another Get but is not penalized as above.

Art: Bathsheba Receiving David's Letter by Jan Steen