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We just upgraded to version 2.7 of Sermon Manager and are seeing a fatal error message. Furthermore, all of our sermon pages are just returning a 404 error. These were all working correctly before upgrading to version 2.7. Below is the error message we are receiving on the admin site:
Uncaught Error: Call to undefined function mb_strpos() in ~/wp-content/plugins/sermon-manager-for-wordpress/includes/admin-functions.php:434
Stack trace:
#0 ~/wp-content/plugins/sermon-manager-for-wordpress/includes/admin-functions.php(390): wpfc_taxonomy_short_description_shorten('The book of Jam...', 130)
#1 ~/wp-includes/class-wp-hook.php(298): wpfc_taxonomy_short_description_rows('
The book of ...', 'mfields_short_d...', 46)
#2 ~/wp-includes/plugin.php(203): WP_Hook->apply_filters('', Array)
#3 ~/wp-admin/includes/class-wp-terms-list-table.php(573): apply_filters('manage_wpfc_ser...', '', 'mfields_short_d...', 46)
#4 ~/wp-admin/includes/class-wp-list-table.php(1305): WP_Terms_List_Table->column_default(Object(WP_Term), 'mfields_short_d...')
#5 ~/wp-admin/includes/class-