In the "Develop with Mobile SDK" Trailhead, the module HTML and Hybrid, Getting Started with Development, I have completed all the instructions for both the iOS and android. I have also built the connected app, added my connected app session ID, and authentication key in my mobile app. The challenge gives an error "Challenge Not yet complete... here's what's wrong: 
You haven't run and logged in from the 'TrailheadHybridTest' app."

I am stuck at this part.