404 After Installing iThemes Security

Hello,

i have a problem with my site after i install iThemes Security
my site suddenly cant open certain files. (report post)
and everything become 404

example is here :
https://filmseri.com/wp-content/themes/FsTheme/report_popup.php?p=2431

please help

Thanks

https://www.ads-software.com/plugins/better-wp-security/