I have tried almost everything , i have even used an extension to over-write the url rewrite but i am not getting the point why i am getting 404 error . I am adding menu using mega menu extension is this an issue ? see the screenshot of the url maybe it will clear some ascpects i am trying to solve this issue from 3 days but no progress .
Hey this issue only occur due to url rewrites in magento so i suggest you to run full indexing once and then clear cache then it might work.
If you find this solution helpful please mark it as solution on upvote.