PS TEXT FORMAT Reference Manual

TFORM Messages
B-10 11387 Tandem Computers Incorporated
REDUNDANT "ON" COMMAND
A SET BOX ON command follows another SET BOX ON command, with
no SET BOX OFF in between.
REQUIRED PARAMETER IS MISSING
A command lacks a needed parameter, such as PAGE with no page
number, or MACRO with no BEGIN or APPEND modifier, or SET BOX
without specifying ON or OFF.
REQUIRED PARAMETER IS MISSING, ZERO WILL BE ASSUMED
TFORM did not find any value specified for the expression contained in a
RETURN command within a FUNCTION construct. TFORM simply
assumes the value for the expression to be zero so that it can complete the
execution of the FUNCTION construct.
RETURN VALUE WAS NOT SPECIFIED FOR FUNCTION
You forgot to include the RETURN expression statement in your
FUNCTION construct.
STACK OVERFLOW
Whenever a condition occurs that TFORM must remember for later
reference, such as a new indentation, TFORM saves that data in its stack. If
too many “opening” conditions occur without enough “closing”
conditions, the stack overflows.