The visual composer do not work when we tried to create or edit a new class
Attached files: Screenshot 2017-12-26 16.12.16.png
First, navigate to "WPBakery Page Builder" > "Role Manager" and make sure the post type is selected (in this case, "polytechnic_courses").
If that doesn't work, try running through these Standard Troubleshooting Steps.
Beyond that, I'll need some additional information to be able to help further: Filing a Ticket
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Attached files: screenshot-polytechnic.themeisland.net-2017-12-29-06-38-02.png