KDFS029A UNABLE TO ATTACH MIGRATION SUBTASK, RC= [return_code ]

Explanation
 			 				The ATTACH macro used to create the migration subtask 				failed. The return code displayed represents the 				contents of register 15 passed back by the ATTACH macro. 			 		
System action
 			The collector terminates. 		
User response
 			 				Refer to the 				 					IBM Application Development Reference: Services for 					Authorized Assembler Language Programs 				 				for an explanation of the return code. If problems 				persist, contact IBM® Software Support. The destination 				is the MVS™ system console. 			 		