Form plugin blank page

Hello.

It's my first post here and I'm newbie with Elgg. Well, I installed the Form plugin in a localhost to test it, but I'm having problems when I try to create the form, in fact it is created but when I try to add a field or change the configuration the result is a blank page. The Elgg version installed is 1.7 and Form plugin 0.8.5

Thanks

Form and related plugins

Form and related plugins

User-generated content, flexible user and group profiles, registration forms, custom file forms