icodes import failing

Hi all,

At the moment I am trying to do a mass import of all the coupons available from icodes. when I try to do the import I keep on getting an error after 5 mins into the import :
Server error 500 A misconfiguration on the server caused a hiccup. Check the server logs, fix the problem, then try again.
URL: https://www.allthehotdeals.com/wp-admin/admin.php?page=wlt_icodes&wlt_icodes_importall
I have changed the max_execution_time to 1500 and this still does not work.
can anyone help?