Roon wont start up and lead me here

Roon instructed me to update my software. I clicked on the update, it restarted and now says there is a problem with my library and wont go any further and provided a link to send me here. i tried downloading a new version of roon and replaced it on my mac and it still does the same. when i launch roon it says it is updating the software and then stalls and gives me the library message.
please help
paul