Hi,

for the Ontario area I see quite a lot of these messages.
They are probably caused by wrong OSM data, e.g.
for way
http://www.openstreetmap.org/way/31703387
resp.
http://www.openstreetmap.org/way/206597309

It's hard to find this with an error message that doesn't show
any details.

Could that be improved?

Gerd