Deploy Panel app on mybinder

I created a mybinder repo at https://mybinder.org/v2/gh/yz3062/mass_flux_explorer/master. This works. Now I want to have a link that directly opens the Panel app, not the whole jupyter notebook, as a standalone page.

Following this page, I appended a segment to my repo’s url: ?urlpath=proxy/5006/panels_github. But it doesn’t work. Could anyone tell me what I did wrong?