Argument string value is invalid

Description

Task: arg.
Argument string arg is invalid and cannot be converted.
Program reference: arg.

Consequences

Program execution stops immediately.

Possible causes

1. The only valid alphabetic characters are a-f and A-F, and only HexToDec.
2. The characters ".", "-" and "+" are not valid for HexToDec.
3. The character "-" is not valid for DecToHex.
4. The value is not a valid integer.

Recommended actions

Edit the argument value string so that it becomes valid and convertible.