FUNL0123 Invalid argument in line (linenum) ((designation)); Fast/Unload cancelled.

This indicates that the FUEL program contains a call to a #function and that an argument has an invalid string value. Designation specifies the purpose of the argument, in terms shown in the documentation of the #function being invoked; it can indicate one of the following purposes:

option

For example, the third argument to #VERPOS must be a string starting with either uppercase 'M' or 'N'.

character

For example, the third argument to #LEFT must be a single character.

required argument(s)

For example, #TRANSLATE requires either argument 2, 3, or 4.

The line number of the FUEL program being executed is shown in linenum.