MPLIR05535I Not a STREAM file.

An attempt has been made to do a GET or PUT operation on a FILE that has not been OPEN(d) as STREAM of Declaration, JCL, and/or environment variables. .
Resolution:
Correct the logical error and run again. PL/I RTS #fileio ctf tracing may provide you with additional information as to the root cause.
Module:
get.pl1, put.pl1