If those are indeed errors coming from Astrolabe you could try to manually update the included library from
http://svn.esamynn.org/astrolabe/trunk/
You'll find r160 there while the last one posted to Curse is r147 for WoW 5.0.4.
I've packaged r160 in the release version of Archy for the last couple months and haven't noticed any ill effects.