Ajax http error using taxonomy to filter view

When creating a new view to show content and filter on a taxonomy term from a dropdown, I get the following error: An AJAX HTTP error occurred. HTTP Result Code: 500 Debugging information follows. Path: /admin/structure/views/ajax/config-item-extra/student_grants/page/filter/term_node_tid_depth StatusText: Service unavailable (with message) ResponseText: Error: [] operator[…]