As a check list; look at these. You should be able to get your hosting company to help you with some of these.
1. Make sure the server meets "All" of the requirements. See the right side of this page.
https://developers.oxwall.com/hosting
2. Make sure all of the file / folder permissions are set correctly.
https://developers.oxwall.com/forum/topic/14334
3. As Chris W. mentioned; make sure your htaccess file is correct. This forum topic shows the default htaccess file. Maybe Chris W. can confirm this.
https://developers.oxwall.com/forum/topic/35841
Just in case. I've attached the current default htaccess I found on Github. See the attached file.