I had this problem as well. When I clicked on your link https://mybinder.org/v2/gh/enricodata/emotion-faces/master?filepath=%2Fvoila%2Frender%2Femotion_classifier.ipynb it has filePath in it as a query parameter. You want urlPath like this: https://mybinder.org/v2/gh/enricodata/emotion-faces/master?urlPath=%2Fvoila%2Frender%2Femotion_classifier.ipynb.
When you are entering the input to the text box labeled Path to a notebook file (optional), you want to change the dropdown from File to URL. The label above the box will change to URL to open (optional). After you click launch, you will be redirected to a deployment page with urlPath instead of filePath in the URL.
Change File to URL.
