404 error while creating new post in custom post type

I have using this plugin on my site. whenever i create new post in custom post type it gives me 404 error not found. All old posts are working fine the problem is when i create new. But this plugin is working fine on localhost.I have tried to solve this problem by deactivating all plugins. But it did not work for me. Please help me to solve this issue.

https://www.ads-software.com/plugins/remove-slug-from-custom-post-type/