1.8 player’s features are available only if it’s connected to 1.8 cms.
In your case, with shared hosting, even if you’d install 1.8 CMS, you will most likely not be able to configure and run XMR, as shared hosting aren’t really suitable for Xibo, for 1.8 series even less so.
01 - Since the error is for not having the XMR address set, would not it be the case for me to set an address in the Public address field? Would not that make the mistake go away?
02 - Just out of curiosity, what addresses would I put in public and private addresses if I was using Docker correctly? I was unable to find instructions on these addresses in the manual.
Would it be the ip address of my server? Or the domain I use to access my xibo system?