Any seo prob in Changing post url in my Wordpress?

[Nafisul Islam]

Few days ago i changed my post url type from "domain/post-name" to "domain/category/post-name". which one is better for seo?

But the problem, i face now is that , after applying this setting all the posts of my blog are now set to the "domain/category/post" url type. As a consequence, my indexed urls are now worthless. whoever visit the indexed url (of domain/postname) before tweaking that setting, come to "no post found" result.

I tried to redirect the "no post found" url to current url. but it works for one or two days only.

Any solution? Thanks