Whats this?
Asset 0 doesnt exist.
Asset 0 is an internal identifier which means if we are talking in terms of assets, we mean the HEAT currency.
Where do you see that?
Edit:
Found where you get that. It seems the Transfer Asset dialog lists HEAT as an option for what Asset to transfer.
What you should do instead, when sending HEAT, is click on the Send Heat button in the toolbar which is one of the image buttons in the top left row of buttons.
Thanks for the fast reply!