...
also, a filterMap configuration is required in the calibrate.astrometry task (CAUTION: this cannot be used for photometric calibration)
cat my_config.pyconfig.calibrate.astrometry.refObjLoader.filterMap={'u':'J', 'g':'J', 'r':'J', 'i': 'J', 'z':'J', 'y': 'J'}
config.calibrate.measurePsf.starSelector.name="secondMoment"
...