Can't Add a New Field in My Form!

Can't Add a New Field in My Form!

I have added lots of different fields in my form in Zoho Creator in the app builder. Now all of a sudden, when I try to add a new field, it says its 'adding' but never actually does. What happened? How can I fix this?

When I create a new form, it works fine even past the number of fields I have now in my original form.