What does a 9001 processing error mean? Thaabit Mollagee March 09, 2016 10:17 Updated Follow This is an unexpected error, the transaction will need to be reprocessed. Related articles Bank Rejection Codes And Reasons Adumo Online API Response Codes What does error 4002 Invalid Card/Invalid Mode mean? What is an ECI indicator? Error Code 25: Unable To Locate Record Comments 0 comments Please sign in to leave a comment.