The event object passed to the event handler when the {@link google.maps.journeySharing.PollingLocationProvider.ispollingchange} event is triggered.
The error that caused the polling state to change, if the state change was caused by an error. Undefined if the state change was due to normal operations.
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The event object passed to the event handler when the {@link google.maps.journeySharing.PollingLocationProvider.ispollingchange} event is triggered.