Hey Damien,
Click on the “Lst file…” tab, you can see it from the screenshot you took. This will open your lst file and when you scroll to the bottom of it you will get more information about the type of errors you are getting.
(Note that to access this file directly, go to the same directory as your trnsys file and it’s the text file in the same name)
Hope this helps,
Bon wkd,
Ciarán