fuaran - I'm guessing you have Garmin maps installed.
After some experimentation I find the function works OK on Garmin Maps but fails on ALL of my OSM based maps. The previous version of Basecamp usually gave me something reasonable on those maps and I've never seen it error out before.
Just giving Start and End points on an OSM map and using the generate route option does produce something, which varies in quality from laughable to quite reasonable, based on the map and the area I'm routing through. Obviously that's what I'd expect, it's the Erroring out on a simple track to route conversion that I find a problem.