Help! I am unable to add Properties to my site

I have been unable to add agents or properties so I had gone through the documentation The documentation was not helpful to my specific problem. So I deleted cache and the site started to save the agent information. But not Property information.

So I went into the word press and with the tools area optimization (I think) I changed the cache to on. The site then locked me on an error page and will not allow me to do anything.
https://luxroatanrealestate.com/wp-admin/update-core.php

The site said either tun off the internal cache or the plugin. But the site is not respsnding. at this time

Hi,

Contact with your purchase item author hope they will help you out from your issue.

Thanks!