I don't know this bot, but maybe it want's to sell x percent and x percent of 0.22 btc is less than the minimum trade amount? At least that was one of the problems of my bots.
That is configurable, you can set that if you want, but I don't think that's the problem. I changed a couple of things around in the exchange wrapper code in the latest commit, I hope this solves a couple of problems that users might be experiencing.
But keep in mind a lot of exchanges have a minimum order size configured... 0.22 BTC shouldn't be a problem, but amounts as small as 0.05 BTC might be.