form_validation doesn't show errors

echo TRUE; will echo nothing.

Ha, ha, ha, true! But...

PHP Code:

$x = $this->form_validation->run();
echo $x; 


What won't echo anything either ... echo prints strings and CI_Form_validation::run() returns a boolean. Any time you cast a boolean to string (in this case, there's an implicit cast), it will become an empty string.

var_dump() should help.