Invalid character found in a based number.
          #3026   Compile-time error
          Invalid character found in a based number.
Additional Information
 The string 'X' contains characters that are not allowed in a
base 'Y' number.
Recovery
Compilation continues but no compiled source code file will be saved.
Explanation
A string of base Y can contain only characters '0' through
character 'Y - 1', where the next character after '9' is 'a' or 'A', and
so on until 'z' or 'Z' for base 36.