An illegal choice has been detected on Views Expose Filter

Please, can't "you" make the Submit on URL is clear/reset value of the limit field?
because, if user change value on first field, drupal allways show error message "An illegal choice has been detected".
When i look on URL, value of the secondari field doest'n change to 'ALL', so, i think, this make drupal show error.

thank's master..