Post type doesn't show in nav menus

Hello!

Thanks for the plugin, works good except for a slight problem. On all my post types (three) I’ve selected true on everything that has to do with public and Show in Nav Menus, but they still doesn’t show up in the menus section. All i get is Pages, Links and Categories.

Any idea why this is happening?

Regards,
Jonathan

https://wordpress.org/plugins/custom-post-type-generator/