Sell function issue

[angelo-di-marzio]

I'm trying to do await maker.service('exchange').sell('ETH', 'DAI', eth_amount); but i can't get it to work.

I have this error Error: call exception (address="xx", method="getBuyAmount(address,address,uint256)", value=["x","x","x"])
(not sure if values are safe to show)

Any idea how i can get more info on th error ?

Thanks