PS TEXT FORMAT Reference Manual

Appendix B TFORM Messages
11387 Tandem Computers Incorporated B-1
Error Messages If PRINT ERRORS ON is in effect (it is by default), TFORM prints an error
message on an extra page following the one on which an error occurs. It
also includes the number of the line in the source file that contains the
error, and the line itself. An asterisk below the line marks the location of
the error within the line.
The following are descriptions of the error messages that may appear.
ARG HAS UNDEFINED VALUE
A macro used the ARG function to access the value of an argument passed
to it by the macro invocation command, but no value had been assigned to
that argument. Use the form ARG(n_,1) to access the text of the argument.
ARG FUNCTION MAY APPEAR ONLY IN MACROS OR FUNCTIONS
An ARG function appeared somewhere other than inside a macro or a
function.
ARITHMETIC OVERFLOW
An operation produced a numeric value that is less than –2147483.647 or
greater than +2147483.647.