About outputting errors

The custom code generator must output an error to the standard output stream ( stdout) when it is not able to properly generate a unique code of the proper format.

The output line for the error must:

Start with 0,

Followed by one or more blank spaces,

Followed by the error message, within double quotation marks.

Example

The following example shows the correct code output format:

0 "error_message"

The error message generated by the custom code generator is displayed to the user and written to the log.