REXX ERROR CODES
03	Program is unreadable
04	Program interrupted
05	Machine storage exhausted
06	Unmatched "/*" or quote
07	WHEN or OTHERWISE expected
08	Unexpected THEN or ELSE
09	Unexpected WHEN or OTHERWISE
10	Unexpected or unmatched END
11	Control stack full
12	Clause too long
13	Invalid character in program
14	Incomplete DO/SELECT/IF
15	Invalid hexadecimal or binary string
16	Label not found
17	Unexpected PROCEDURE
18	THEN expected
19	String or symbol expected
20	Symbol expected
21	Invalid data on end of clause
22	Invalid character string
23	Invalid SBCS/DBCS mixed string
24	Invalid TRACE request
25	Invalid sub-keyword found
26	Invalid whole number
27	Invalid DO syntax
28	Invalid LEAVE or ITERATE
29	Environment name too long
30	Name or string > 250 characters
31	Name starts with number or “.”
32	Invalid use of stem
33	Invalid expression result
34	Logical value not 0 or 1
35	Invalid expression
36	Unmatched “(” in expression
37	Unexpected “,” or “)”
38	Invalid template or pattern
39	Evaluation stack overflow
40	Incorrect call to routine
41	Bad arithmetic conversion
42	Arithmetic overflow/underflow
43	Routine not found
44	Function did not return data
45	No data specified on function RETURN
46	Invalid variable reference
47	Unexpected label
48	Failure in system service
49	Interpreter failure

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