I installed the quickstart of Educon template and it went well except that there is an error when I use the Prime layout. Error listed below:

Warning: Undefined variable $default_course in .../templates/shaper_educon/sppagebuilder/addons/courses/site.php on line 289

Warning: Attempt to read property "url" on null in .../templates/shaper_educon/sppagebuilder/addons/courses/site.php on line 289

How can we fix this?