PS TEXT FORMAT Reference Manual

TFORM Messages
B-14 11387 Tandem Computers Incorporated
TOO MANY "SOURCE" COMMANDS ENCOUNTERED
A file read in by a SOURCE command may contain a SOURCE command
that reads another file, which in turn may source in a third file, and so on;
but not more than 32 input files may be open at one time.
TWO "ELSE" COMMANDS FOR AN "IF" COMMAND
An IF construct can have only one ELSE command.
TYPE MISMATCH
A numeric entity and a string entity can’t be combined by a single operator.
This message may also appear if a function or macro sees a string value
when it expects a numeric value, or vice versa.
UNBALANCED PARENTHESES
In expressions and function references, left and right parentheses must
exist in even numbers and must correspond to one another.
UNDEFINED VARIABLE
An expression contains (or is) a variable that has not yet had a value
assigned to it.