Do not let me create a new page

Good morning, I am writing to see if I can help. When trying to create a new page in the menu of wp, it gives me an error and tells me

Are you sure you want to do this?

Try again please.

And I return to the menu adm wp

I beg indicate what may be the problem.

Thank you very much

Hi

I am not sure why this happens but it could be a conflict between wordpress and some plugin. Try to deactivate all plugin except Visual Composer, clear all caches then test the site again.

Let us know how it goes.
Thanks!