• MimicryBoy
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 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?

User-added image
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.