Failed to edit the website using salient theme and visual composer

Hello,

I’m in trouble about editing my website recently. When I click on the editing page, all the rows of my website have gone. Even when I click on + for adding new elements to the site by Salient Visual Composer, it shows nothing afterward.

I have gone through some comments on the internet and some suggested that it may be due to plug in errors. So I deactivated all the plugins and try again, but it doesn’t work.

The original pages are still here but the problem is I can’t edit or update the site, so please help me ToT