Facing the There was an unhandled exception. Please reference ID: XRSJHNFB. Error while attempting the trailhead challenge

Hi , 

 What is the trailhead that is experiencing this error? Please provide the URL of the trailhead.  

The same type of error is also occurring in the module "Build an App to Track Your Trailblazer Journey > Create the My Trailblazer Journey App."