ELO Touchscreen drivers and calibration

I’m trying to use the ELO touchscreen driver.

I try to start the ELO driver with

devi-elo smartset fd -d/dev/ser1 abs -c

to calibrate it (the -c says to calibrate it)

The driver responds with “cannot open calibration file…”

When I try to run the calibration utility (Calib) without the driver
running, the calib program doesn’t seem to respond (I had \to reboot to
kill calib), but I can’t run the driver because I don’t have a
calibration file! What do I do?