Demetra ErrorScreen

So far I can't seem to get through the whole process in Demetra of producing a 1D spectrum from a 2D spectrum image using the ALPY600. I invariably get hung up at the wavelength calibration step and the whole mess grinds to a halt. I've changed the calibration lamp images many times using different exposure times from 0.5 sec to as much as 50 sec and it doesn't seem to matter... I get the same error. The calibration lamp images were taken at the telescope during the imaging session last night.