Umbraco Forms Entries Panel not showing records

I just installed Umbraco Forms into Umbraco version 7.1.4. I created a test form and it seems to be working, and it is emailing me the record data. I can also save the entries as a content node and as xml. So the data is there. However, the entries are not showing up in the backoffice entries panel. It is completely blank.

Chrome developer tools says it failed to load the UmbracoForms/Record/postRetrieveRecords.


This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/81992-umbraco-forms-entries-panel-not-showing-records