IBM REXX Question: Download IBM REXX PDF

i am getting error while editing macro, its not even entering into the macro, getting error like
31 - "EDIT DATASET(\"DSN"("MEM")) MACRO("CHGLINE")"
+++ RC(-3) +++? any idea
Why?

You must turn on ISPEXEC Address.

Address ISPEXEC "EDIT dataset(xx) macro(mmm)"

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