links_with_navigation.php:59 - $PAGE->requires->js_init_call('M.block_course_menu_fix_links.init', array(), true, $module);

There appears to be some JS files missing from the repository, as the page is requiring functions that are not available.

Steps to replicate:

• Add course menu block to course.
• Configure the course menu block.
• Activate custom links.
• Add a custom link and enable "Keep page navigation visible on the same page".
• Save changes and click on the custom link.

Debug:
Exception: Coding error detected, it must be fixed by a programmer: Attempt to require a JavaScript file that does not exist. in ./lib/outputrequirementslib.php on line 689.
Stack trace:
line 689 of ./lib/outputrequirementslib.php: coding_exception thrown
line 821 of ./lib/outputrequirementslib.php: call to page_requirements_manager->js_fix_url()
line 1044 of ./lib/outputrequirementslib.php: call to page_requirements_manager->js_module()
line 1023 of ./lib/outputrequirementslib.php: call to page_requirements_manager->js_init_code()
line 59 of ./blocks/course_menu/link_with_navigation.php: call to page_requirements_manager->js_init_call()

Using the latest code from the GitHub repository.