An error occured while attempting to process /ajax/ajax_facets/refresh:$.blockUI is not a function Ajax facets work but I get an error "An error occured while attempting to process /ajax/ajax_facets/refresh:$.blockUI is not a function" when I click on ajax links with checkboxes for the facets for the first time.

I am using search api views as per mentioned in the project description
You can check the error in the screenshot attached
The above issue was occuring due to conflict with other module Ajax Screen Lock
Disabling it solves the problem.