The issue with course catalog's migration and how to fix it is described in the article.
After the migrating of a course catalog, the newly created page will not open, simply displaying;
'Sorry, something went wrong
In this case, you need to activate/reactivate the Site Page feature for this course catalog.
To do this, please, follow the next steps:
1) Go to your Course Catalog page - Gear icon - Site content - Site settings - under Site Actions option select Manage site features - Activate Site Pages feature: