CI 2.1.0 form validation external callbacks via the newly available param

[eluser]chenx[/eluser]
Hello.

Thanks for skunkbad for solving my problem with Form Validation.

But still, I have some things needed to be solve here, it's the error message.

Because we're using the function external_callback, the error message only return the error for external_callback.

How can I return the error message from each of my model function?

Sorry for my bad english. Thanks for helping.