Crash Detected

I just installed the Retractable Purge Mechanism. I did a test print and when the extruder move over to do the purge it presses the arm and the mechanism moves to it's position but then I get a message on my LCD screen that there was a Crash Detected. At this point it moves the extruder over to the left front corner of the build plate then moves back over to the right side by the purge mechanism but not far enough to trigger the mechanism and the does the purge on to the build plate.

I have a Prusa i3 MK3 with a Mosquito Hot End.