Last wotlk version of Auctioneer (5.8.4723) works with this addon:
https://www.curseforge.com/wow/addon...r/files/427823
First Cata version of Auctioneer (5.9.4961) should work on wotlk without this addon:
https://www.curseforge.com/wow/addon...r/files/466767
If you are still having issues with it, post some more details.