read the fi document.i found it is better than liduidity.but when I try to follow this https://medium.com/coinmonks/getting-started-with-fi-a8eea75733db. failed. <img width="625" alt="image" src="https://user-images.githubusercontent.com/38914615/53797796-e78ad300-3f71-11e9-9472-f4f027e35b2e.png">