Hello Guys! Sometimes after installing Visual Composer Plugin to your wordpress website you may not be able to use that for Posts or for other custom post types.
To be able to do that, you need to activate visual composer for the specific post type.
Ok, so you log in to your dashboard, then navigate to Visual Composer > Role Manager and then set the Post Type to Custom from the Dropdown. Finally Check the post types you want to edit with Visual Composer. Scroll all the way down to the bottom and click on Save changes!
Go back to the Add New Post or Add New YourCustomPost, BOOM! The Visual Composer is Activated!