These types of issues may happen for multiple reasons. One common reason you get a 404 error is your permalinks are not set properly.
1- Login to your WordPress Dashboard
2- Go to Settings > Permalinks
3- Make sure **Post name (http://yoursite-domain/sample-post/ )** sellected
5- Go to record list and pick one record
6- Hover over the title field and pick View from the quick links
7- See if you can view the record on the frontend properly
If the steps above does not work, you have a WordPress installation or configuration issue not related to the plugin.