I keep getting this error from the challenge.  I logged into my developer console from the Trailhead challenge screen using same email address (only have one on Salesforce.com) and nothing has changed since I started the developer track on Trailhead, which requires numerous challenges.

The Apex class named StringArrayTest shows up on the development console and from the setup interface in the developer section....

I am puzzled how it can show up on both and after entering from the trailhead challenge logon to developer edition and still have this error that is is not  found.  Any suggestion????

I am completing a challenge on Admin Beginner: Chatter Basics - Approving Records from the Feed.  When I check my challenge I receive the mession below....but I did create the approval process.  What is wrong?
"Challenge Not yet complete... here's what's wrong: 
There was an unexpected error in your org which is preventing this assessment check from completing: System.DmlException: Process failed. First exception on row 0; first error: NO_APPLICABLE_PROCESS, No applicable approval process was found.: []"

I keep getting this error from the challenge.  I logged into my developer console from the Trailhead challenge screen using same email address (only have one on Salesforce.com) and nothing has changed since I started the developer track on Trailhead, which requires numerous challenges.

The Apex class named StringArrayTest shows up on the development console and from the setup interface in the developer section....

I am puzzled how it can show up on both and after entering from the trailhead challenge logon to developer edition and still have this error that is is not  found.  Any suggestion????