Also, you have to make sure that you have create the tables that you used in the DB. with the corresponding Keys

I think you had an "Execute SQL Task", so to correct this error, an alternative is to make a EvenHadler "Send Mail Task", this will send you and Email with...

Error solved, the thing is that the input of the table difference are two data flows, from two differents DB, so for example, the field from database 1 is UserId...