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C.1.21. Error 24 - Invalid TRACE request.

Explanation:

This message is issued when:
  • The option on a TRACE instruction or the argument to the built-in function does not start with A, C, E, F, I, L, N, O, or R.
  • In interactive debugging, you entered a number that is not a whole number.

The associated subcodes are:
001

TRACE request letter must be one of "ACEFILNOR"; found "value".
901

Numeric TRACE requests are valid only from interactive debugging.