Error object has extra properties that appear only when the error is thrown from an asynchronous Windows Runtime method when the app is running in debug mode.
Special Error Properties
An error object that results from a failed Windows Runtime asynchronous operation in debug mode has the following special properties:
asyncOpSource(Object) Gets information about the original location where the call that produced an error was made. The property
asyncOpSource.originatingCall(String) displays the location in the user's code that originated the asynchronous operation.
asyncOpType (String) Gets the name of the asynchronous operation type that raised the error.
For more information about errors with asynchronous operations, see: