DFS3581A READ ERROR. MEMBER NAME = `member name` RETURN CODE = 12

Explanation
 An I/O error occurred during the read of a block
from an input member. Return code 12 is a Sort/Split utility return
code, not an I/O return code.

System action
 Processing is terminated.

Programmer response
 See the Data Administration: Macro
Instruction Reference for MVS/DFP.