Upgrade Failure from Version 14.9 to 15.1 – Error REQ:2001

Upgrade Failure from Version 14.9 to 15.1 – Error REQ:2001

Hello,

I've 5 instances of service desk 3 of them I've already update successful, but in one when i try to update from version 14.9 to 15.1 I receive the error 
REQ:2001: Unable to initiate migration because of inconsistent data in 6 trash requests


                  New to ADSelfService Plus?