Subscribe Download PDF Labeler - Error - "Number of labels specified is invalid. Please specify a number of labels greater than 0" "System Error 5. Invalid Procedure call or argument (WASPLAB). [Details: frmPrint1::Validate Persist()]". Internal User 2017-04-10 in Version 7 The page is setup with 1 label across and 0 labels down. This is invalid. Create a new page layout ensuring that the number of labels across and down is at least 1.