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I try to activate All in one WP Security and Firewall but I receive the following message “Fatal error: Uncaught Error: Call to undefined function filter_var() in /home/dh_gd92zd/sadlegal.com/wp-content/plugins/tmp-all-in-one-wp-security-and-firewall/classes/wp-security-utility.php:573 Stack trace: #0 /home/dh_gd92zd/sadlegal.com/wp-content/plugins/tmp-all-in-one-wp-security-and-firewall/classes/wp-security-installer.php(162): AIOWPSecurity_Utility::get_server_type() #1 /home/dh_gd92zd/sadlegal.com/wp-content/plugins/tmp-all-in-one-wp-security-and-firewall/classes/wp-security-installer.php(26): AIOWPSecurity_Installer::create_db_backup_dir() #2 /home/dh_gd92zd/sadlegal.com/wp-content/plugins/tmp-all-in-one-wp-security-and-firewall/wp-security-core.php(145): AIOWPSecurity_Installer::run_installer(”) #3 /home/dh_gd92zd/sadlegal.com/wp-includes/class-wp-hook.php(288): AIO_WP_Security::activate_handler(”) #4 /home/dh_gd92zd/sadlegal.com/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters(”, Array) #5 /home/dh_gd92zd/sadlegal.com/wp-includes/plugin.php(478): WP_Hook->do_action(Array) #6 /home/dh_gd92zd/sad in /home/dh_gd92zd/sadlegal.com/wp-content/plugins/tmp-all-in-one-wp-security-and-firewall/classes/wp-security-utility.php on line 573″.
Can anybody help?