Can’t update my site

Below is the error I’m getting when trying to make a change to the website: “Publishing failed, You are probably offline.”

I’ve done some research and it was noted that plugins could be causing it.  Either out of date or bad plugins.  I’ve updated all plugins, and have deactivated all, but still get the following error when i go to the widgets section of the page to try and change some of the info on the prayer widget (mainly Jummuah prayer times).

The page I need help with: [log in to see the link]