Hi All,
I know it is not an ACP issue, but maybe someone has had the same problem and can advise.
I have now had the problem 2 nights in a row.
I normally use Scheduler and have never had the error before.
But now using ACP for the first time in a while, the problem occurs during an autofocus operation.
There were other autofocus operations before this without a problem.
There is also no FMax log for the period leading up to this.
Any help appreciated.

Dale

22:17:15 Selecting Green filter (1) for imaging
22:17:15 Do periodic or plan-start auto-focus...
22:17:15 [flip check: Tn=600s HAc=-11321s GW=F HAz=-10721s DWz=F WF=no]
22:17:17 Search 15 deg-square area for suitable target stars
22:17:17 Looking for stars between mags 6 and 9
22:17:18 Found mag 6.2 star, 3UC145-428132; nothing within 660 arcsec.
22:17:18 Star J2000 coordinates RA=20:28:52 Dec=-17 48' 48"
22:17:18 Using star at mag 6.2. Slew to star.
22:17:18 Start slew to AutoFocus...
22:17:23 (wait for slew to complete)
22:17:30 (slew complete)
22:17:30 Updating pointing...
22:17:30 Switching from Blue to Lum filter for pointing exposure
22:17:30 Focus change of 2049 steps required
22:17:34 (taking 5 sec. exposure, Lum filter, binning = 4)
22:17:34 (using Mode 1 readout mode)
22:17:34 (starting exposure)
22:17:41 (exposure complete and image downloaded)
22:17:41 Calibrating image...
22:17:41 **Calibration failed. Original image saved.
22:17:41 **MaxIm reports No suitable calibration groups were found.
22:17:41 Image finished
22:17:41 Plate-solve pointing image.
22:17:42 159 image stars found
22:17:42 123 catalog stars found
22:17:42 Solved! 47 stars matched.
22:17:42 Average residual is 0.22 arcsec.
22:17:42 Pointing error is 0.059 arcmin @ angle 189.61
22:17:42 True focal length is 3882.3 mm.
22:17:42 True binned plate scales (arcsec/pix): H = 1.91 V = 1.91
22:17:42 True image center (J2000): 20h 28m 51.6s -17 48' 51.92"
22:17:42 Imager sky position angle is 179.2 deg.
22:17:42 Image FWHM is 4.3 arcsec (2.25 pixels)
22:17:42 (avg FWHM = 4.29 arcsec)
22:17:44 [sync] telescope synced
22:17:44 Within max error tolerance, no re-slew needed.
22:17:44 Target is now centered.
22:17:44 (AF will use Mode 1 readout mode)
22:17:44 Starting Autofocus...
22:17:44 **Script Error (Tracking has been stopped)**
22:17:59 Source: FocusMax
22:17:59 Message: Busy with another operation
ACP console log closed 10-Jun-2013 22:17:59 UTC