dataRoot="/datasets/gapon/data/DC_2013/calexps/"

butlerPolicy="calexp"

ids = id {'filter': u'g', 'field': 694, 'camcol': 4, 'run': 5646}

def getImageByIds(self, ids):

    butler = lsst.daf.persistence.Butler(dataRoot)

    img = butler.get(butlerPolicy, dataId=ids)

    return img, butler

  File "/lsst/stack/dax_imgserv/python/lsst/dax/imgserv/locateImage.py", line 286, in getImageByIds

    img = butler.get(self._butlerPolicy, dataId=ids)

  File "/lsst/stack/Linux64/daf_persistence/12.1/python/lsst/daf/persistence/butler.py", line 586, in get

    location = repoData.repo.map(datasetType, dataId)

  File "/lsst/stack/Linux64/daf_persistence/12.1/python/lsst/daf/persistence/repository.py", line 180, in map

    loc = self._mapper.map(*args, **kwargs)

  File "/lsst/stack/Linux64/daf_persistence/12.1/python/lsst/daf/persistence/mapper.py", line 173, in map

    return func(self.validate(dataId), write)

  File "/lsst/stack/Linux64/daf_butlerUtils/12.1+1/python/lsst/daf/butlerUtils/cameraMapper.py", line 294, in mapClosure

    return mapping.map(mapper, dataId, write)

  File "/lsst/stack/Linux64/daf_butlerUtils/12.1+1/python/lsst/daf/butlerUtils/mapping.py", line 142, in map

    return ButlerLocation(self.python, self.persistable, self.storage, path, additionalData, mapper)

  File "/lsst/stack/Linux64/daf_persistence/12.1/python/lsst/daf/persistence/butlerLocation.py", line 62, in __init__

    self.additionalData.set(k, v)

  File "/lsst/stack/Linux64/daf_base/12.1/python/lsst/daf/base/baseLib.py", line 4136, in _PS_setValue

    return _propertyContainerSet(self, name, value, _PS_typeMenu)

  File "/lsst/stack/Linux64/daf_base/12.1/python/lsst/daf/base/baseLib.py", line 4098, in _propertyContainerSet

    raise lsst.pex.exceptions.TypeError("Unknown value type for %s: %s" % (name, t))

TypeError: Unknown value type for filter: <type 'unicode'>