GYR Assignment 3 Error - If: Object reference not set to an instance of an object

In Assignment 3 , Generate Yearly Report , i found an Error while running in Get Transaction Data in an If Condition,

Can some onle help me ? i have Uploaded my work file. GenerateYearlyReport_Dispatcher_Error.zip (1.2 MB)

Change TransactionItem.Equals("") to String.IsNullOrEmpty(TransactionItem).

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