I ran into this trying to use my astroberry to control my AM5 mount. The error messages were, from first to last,
"Couldn't get date format string from device"
Error setting UTC offset
followed by the errors in slewing; something to the effect that "Couldn't slew to <<RA, DEC>> JNow (I don't recall the exact words), so I assume the error in getting the date cascaded into an error computing the slew target coordinates.
My astroberry is up to date with respect to the astroberry repositories (but not, of course, with kstars-bleeding)