There has been a critical error on your website.

I use visual form in my WordPress and when you try to send the form apear this:

There has been a critical error on your website.

Learn more about debugging in WordPress.

The pics yes are upload to our gallery but not the rest of the form, and don′t send the mail with the form.
Can anibody help me to resolve it? I think is something with the new WordPress update. The rest of the webpage Works perferctly.

Thanks