Withered Treant turn in North Karana
 

I tried to turn in the components for the Cleansed Spirit of Antonica
(chunk of tundra, clean lake water, ancient rock)
and I'm not even able to give the third item to him before the trade is cancelled.
He (or it?) does not respond to hails and is apprehensive to me.

Yes, I've made sure to hand him the correct items, but I don't even get the chance to click on "give"