Exception Type: Nil Object Exception

1: Sub MainWindow.MainWindow.ChangeObsDateTime( MainWindow.MainWindow )

2: Sub MainWindow.MainWindow.EditObservationBtn_Action( MainWindow.MainWindow )

3: Sub Delegate.Invoke()

4: Sub Application._CallFunctionWithExceptionHandling()

User description of above error trace:

Deleted one of a pair of observations associated with an object.

Just clicked on clock icon to change time of remaining observation.