Form validation language not find

I'm having the following message in my error log and can not find where is the problem in codeigniter.

ERROR - 2014-11-27 09:47:40 --> Could not find the language line "form_validation_"

have you this value in your /application/config/config.php

$config['language'] = 'english';

It is exactly in this configuration. This error message does not appear all the time. There's no way I debug which form is returning this error?

Sounds strange to me, if the error only appear from time to time. Can you debug each form one by one? In your config you can set the debgging level

$config['log_threshold'] = 4; // for all messages

Maybe you get more information to find the error. Read also this

https://github.com/bcit-ci/CodeIgniter/w...-Threshold

and there is also a debugging helper

https://github.com/yahyaerturan/codeigni...bug-helper