Key errors

The low-order two digits are the number of the key that failed the parse, offset by 20. The first key has the value 21, resulting in a return code of -21.

The high-order two digits are an internal diagnostic code that indicates where in the code the parse failed. If the high digits are 0, the key itself was probably not recognized. Other values usually indicate a problem with the argument for the failing keyword. Likely causes for failure are:

Blanks in arguments that are not quoted
Misspelling of keywords