Contact Form 7 – Forbidden on edit form

We tried to give 777 permissions but still continues with the error….

Help please!

Try switching to the default theme and deactivating all other plugins.

Thanks for your response.
With the default Theme works ok.
But with Haze theme continue the error:
https://themeforest.net/item/haze-beautiful-wordpress-theme/

OK. That suggests the Haze theme is causing the problem. The URL you wrote responses “Page Not Found” error. Is the URL correct?