Практика употребления глагола must

Uncaught Error: Too few arguments to function OCS_Structure_Factory::get_module_title(), 1 passed in /var/www/www-root/data/www/enreta.ru/wp-content/wp-recall/add-on/online-courses/core/class-ocs-course-walker.php on line 159 and exactly 3 expected in /var/www/www-root/data/www/enreta.ru/wp-content/wp-recall/add-on/online-courses/core/class-ocs-structure-factory.php on line 231

get_module_title()
wp-content/wp-recall/add-on/online-courses/core/class-ocs-course-walker.php:159
get_single_module_content()
wp-content/wp-recall/add-on/online-courses/core/class-ocs-structure-factory.php:216
get_single_section_content()
wp-content/wp-recall/add-on/online-courses/core/class-ocs-structure-factory.php:178
get_course_structure_content()
wp-content/wp-recall/add-on/online-courses/core/class-ocs-structure-factory.php:158
get_single_course_content()
wp-content/wp-recall/add-on/online-courses/core/class-ocs-structure-factory.php:123
get_structure()
wp-content/wp-recall/add-on/online-courses/index.php:169
ocs_get_current_course()
wp-includes/shortcodes.php:356
do_shortcode_tag()
preg_replace_callback()
wp-includes/shortcodes.php:228
do_shortcode()
wp-includes/class-wp-hook.php:309
apply_filters()
wp-includes/plugin.php:191
apply_filters()
wp-includes/widgets/class-wp-widget-text.php:296
widget()
wp-includes/class-wp-widget.php:393
display_callback()
wp-includes/widgets.php:835
dynamic_sidebar()
wp-content/themes/enreta/sidebar.php:47
require_once()
wp-includes/template.php:770
load_template()
wp-includes/template.php:716
locate_template()
wp-includes/general-template.php:136
get_sidebar()
wp-content/themes/enreta/single-course-tests.php:19
include()
wp-includes/template-loader.php:106
require_once()
wp-blog-header.php:19
require()
index.php:17