Visual Composer doesn't load

Hello,

I have many problems with this theme but i get developer for solving some issues, but now this issue i have no solution for it !

When i try to edit my “Home Page” or any other pages using “visual composer” and click on “Edit with Visual Composer” it keeps load like that :

https://gyazo.com/f2d32c6970319abe6ee15248a02fd9ca

so please tell me what is the solution ASAP because my work stuck because of this issue !

Regards