Hi Narendra,

Creating the "Key Sales Data" app was tricky because of my failure to look at the whole page.  I missed the "actions" section on the bottom right!
By the time that I found the "actions" section, I had created a "Key Sales Data" home page, a "Key Sales Data" object....etc.  What a mess!   Start with an "App Page"!
Pesky Paloma requires an awfully high amount of personal customization!  Before you create the New Lightning App specifically for her, make sure to read the challenge requirements in order to generate the correct API name.


Errors & Solutions:

There was an unhandled exception. Please reference ID: VRVEIUZR. Error: Faraday::ClientError. Message: MALFORMED_QUERY: When retrieving results with Metadata or FullName fields, the query qualifications must specify no more than one row for retrieval. Result size: 2 
Solution: I had near-duplicate API names.  Key_Sales_Data and Key_Sales_Data3 were two API names of lightning pages.  "Key_Sales_Data3" was creating the error.  I changed the API name.  Problem solved!  If you see this error, search for a duplicate API name. 

Didn't find the All Lusso Scarpe Employee group record page
Solution: Create the chatter group and create the lightning record page.   A hint: to create the group, you will not be in setup! 

Hope this helps.

Thanks,
Nagendra