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If I enter the plugin’s Dashboard this is the output given by Query Monitor.
Fatal error: Uncaught Error: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method SG_Security\Sg_2fa\Sg_2fa::show_notices() cannot be called statically
in /home/user/mywebsite.com/wp-includes/class-wp-hook.php on line 308
Call stack:
WP_Hook::apply_filters()
wp-includes/class-wp-hook.php:332
WP_Hook::do_action()
wp-includes/plugin.php:517
do_action()
wp-admin/admin-header.php:303
require_once()
wp-admin/admin.php:239