See this Comm Center thread by Mark Williams. With the dome/roof opened Test Dawn Cal Frames produces




08-Mar-2014 18:50:39.4: ERROR: Dawn cal frames requested, but the Dome/Roof was still open!
08-Mar-2014 18:50:39.4: ...... This should not have happened. Contact the developer.




but much worse, once the dome/roof is closed, the test results in an exception that ends in a fatal program error.




08-Mar-2014 18:51:55.1: Weather disconnected.
08-Mar-2014 18:51:55.1: **EXCEPTION IN SCHEDULER:
08-Mar-2014 18:51:55.1: Automation error
Object is not connected to server 
08-Mar-2014 18:51:55.1: Traceback:
   at ACP.WeatherClass.get_Available()
   at DC3.Scheduler.ACPSequencer.get_FilteredWeatherSafe()
   at DC3.Scheduler.ACPSequencer.get_WeatherSafe()
   at DC3.Scheduler.Engine.PollWeather()
   at DC3.Scheduler.Engine.Run()
08-Mar-2014 18:51:55.1: Release ACP sequencer

Fixed as part of SCHEDULER-1142