I have successfully completed the trailhead challenge in my Dev org which is as follows:
Create a test harness app and component
Let's get set up for doing development right now. You'll create a test harness Lightning application, and add a simple component to it. Then you'll verify that you can see changes in the component.

• Create a new Lightning component named myFirstComponent
• Add this static text to the component: I solemnly swear I know JavaScript
• Create a new Lightning application named harnessApp
• Add myFirstComponent to the harness app with this markup: <c:myFirstComponent/>
• Click the Preview button and verify your text is displayed
• Make a change to the static text so it reads: I am proficient in JavaScript
• Click the Preview button again and verify your change is displayed

When I try to verify the challenge, it displays as error as follows:
Challenge Not yet complete... here's what's wrong: 
The 'harnessApp' Lightning App does not contain ''.

I am unable to understand the error. Anyone who received similar kind of error and were able to proceed further, Please help me with this.

Hello,

Part of the module is where you create couple of profiles with object level permissions. Accordingly i have set the right permissions for account object (R/E/VA), Opportunity (R/C/E) -- NO VIEW ALL for Field Sales Profile.

Everytime i check the challenge am getting below error; any help.
Error:
Challenge Not yet complete... here's what's wrong: 
The Field Sales User does not appear to have the correct object permissions for Accounts and Opportunities.