I am following the Detailed Instructions for the exercise. After I click to create the REST integration (step 6):

• I get a popup saying

“http://localhost:9080/prweb says

Generation process has been canceled and all created records have been removed”

• I dismiss the popup
• In the generation summary I see details “Canceling rule generation, Error evaluating rules using sample JSON stream

Json Structure :-

{         "majorDimension": "ROWS",         "range": "Sheet1!A1:D5",         "values": [           [             "Item",             "Cost",             "Stocked",             "Ship Date"           ],           [             "Wheel",             "$20.50",             "4",             "3/1/2016"           ],           [             "Door",             "$15",             "2",             "3/15/2016"           ],           [             "Engine",             "$100",             "1",             "3/20/2016"           ],           [             "Totals",             "=SUM(B2:B4)",             "=SUM(C2:C4)",             "=MAX(D2:D4)"           ]         ]       }