FABJ0129E GDG BASE NOT FOUND. LOCATE MACRO ERROR RC=`xx`

Explanation
 A symbolic parameter &GDG is specified, but
a generation data group base entry was not found by the LOCATE macro.

System action
 Program FABJMAIN stops processing with a return
code of 16.

User response
 Check the return code of the LOCATE macro by referring to the DFP System Program Reference, correct the error, and rerun the job.