All you have to do is refresh permalink settings again at backend 
To Fix Permalink Issues

1. Log in to your WordPress admin panel.
2. Click Settings.
3. From the Settings menu, click Permalinks.
4. Note which kind of Permalink you currently use.
5. Select any Permalink setting other than the one you currently use, and then click Save Changes.
6. Select your original Permalink setting, and then click Save Changes.