Steps to reproduce:
1. Stop the capture agent after it has been attached to an admin node
2. Change the names of the capture agent devices (e.g. vga -> screen)
3. Schedule a capture with the admin node with the wrong capture device name of vga.
4.Turn the capture agent on before the scheduled capture.
5. Get the completely useless error:
2013-04-04 11:56:00 ERROR (GStreamerPipeline:215) - [Ljava.lang.StackTraceElement;@7c8557f5