Problem Creating forum category

when i tried to create forum categories on johncms 5.2.1 using wamp server i get INVALID REQUEST not only there other places too , whats the solution please

Replace

validate_referer();

//validate_referer();

# alibek_kz (19.04.2014 / 16:45)
Replace

validate_referer();

To

//validate_referer();

In /incfiles/core.php

closed