Conference Management App - Create a Lightning Component with Server-Side Apex Controller:

Step 5: Add Component to the Speaker Record Page
Click App Default and then Assign as App Default.
Select the Conference app, then click Next and then Save.
Question: Does anyone know why Conference Management App is not listed for selection?


I am also getting this error when I verify the hands on challenge:Note all APEX codes saved without errors. and all other steps worked.
Step 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.QueryException: List has no rows for assignment to SObject

Thanks in advance for your help.

By no means am I a coder/developer but I was excited to have made it this far. I am literally having trouble with this last step and I am not sure how I am to format my code. The goal is to:

1. Make the class global, implement the Batchable interface, and define the three methods of the interface​
2. Declare three instance variables to store the query, the email subject, and the email body
3. Define a constructor implemented
4. Implement the start() method 
5. Implement the execute() 

I am not sure if these tasks were to be executed seperately or combined within the code all together. Here is where I'm at:





Any help is greatly appreciated!