I am trying to add a Solr Collection in the cf admin, but I get an error no matter what I call the collection. As you can see in the image there are no collections defined. Can anybody help me with this error?

you have to add the collection with collection tag,

cfcollection action = "create" 
    collection = "a_new_collection" 
    path = "c:\CFusion\verity\collections\"

@Evil Ware thanks so much for your reply. I am using macOS and I don't see anything related to Verity in the cf install, in the cf admin I see that Solr is located at - /Applications/ColdFusion2023/cfusion/jetty/multicore should I use this instead of c:\CFusion\verity\collections\?

Correct, use what ever system path your computer to Coldfusion / your solor instance.