Problems with extending CI_Form_validation

Rename your class AdvancedValidation to Form_validation
Rename the file from AdvancedValidation.php to Form_validation.php

When loading CI_Form_validation the extended Form_validation will be auto loaded.

i followed what you said exactly

Form_validation.php

PHP Code:

class Form_validation extends CI_Form_validation 


but i got this error. Even if i try this ....extends Form_validation {....

Code:

A PHP Error was encountered

Severity: Error

Message: Class 'CI_Form_validation' not found

Filename: libraries/Form_validation.php

Line Number: 5

Backtrace: