The getEventTime function was called on a tuple without an event-time attribute.
The getEventTime SPL function was called, passing a tuple type which does not contain an event-time attribute.
The event-time attribute is defined by the window definition of a timeInterval window downstream from the operator where the getEventTime method was called. Ensure that there is such a window, and that the tuple passed to getEventTime contains the attribute defined in the window definition.
