Keep domain name for Omeka S

I want to keep the same domain name as I shift over to Omeka S from Omeka classic, but I want to put up entirely new data. But when I deleted Omeka classic and installed Omeka S with the same domain, I got this message. Is there a way I can keep the same domain name but create a totally new site with Omeka?

Fatal error : Uncaught Error: Class ‘Omeka_Application’ not found in /home/earlywom/public_html/cms/admin/index.php:17 Stack trace: #0 {main} thrown in /home/earlywom/public_html/cms/admin/index.php on line 17