Visual Composer won't load

I want to make changes to the page layout, and when I try to use the visual composer it just keep showing the same load icon and it won’t load the page for editing? I was just using it the day before yesterday without any problems, and today it won’t load the page. It shows that icon that cycles like a sheets of paper.

I’ve seen it happen before or the psycho like this, but the next time I try to use it it worked. Now I can’t get it to work at all.