IndexError                                Traceback (most recent call last)

/clusterfs/henyey/mqk/JiHoon/MWgalaxy_PPM/<ipython console> in <module>()

/clusterfs/henyey/mqk/JiHoon/MWgalaxy_PPM/test.py in <module>()
     20
     21 pf = load('DD0030/galaxy0030')
     22 region = pf.h.region((0.5,0.5,0.5),(0.0,0.0,0.0),(1.0,1.0,1.0))
---> 23 ColdGasMass = region.quantities['ColdGasMass'](Tcold=1e3)
     24 print ColdGasMass

/global/home/users/mqk/local/yt-x86_64/lib/python2.7/site-packages/yt-2.3dev-py2.7-linux-x86_64.egg/yt/data_objects/derived_quantities.pyc in __call__(self, *args, **kwargs)
     90                           self._data_source.pf.h.io)
     91         if lazy_reader and not self.force_unlazy:
---> 92             return self._call_func_lazy(args, kwargs)
     93         else:
     94             return self._call_func_unlazy(args, kwargs)

/global/home/users/mqk/local/yt-x86_64/lib/python2.7/site-packages/yt-2.3dev-py2.7-linux-x86_64.egg/yt/data_objects/derived_quantities.pyc in _call_func_lazy(self, args, kwargs)
     98         for gi,g in enumerate(self._get_grids()):
     99             rv = self.func(GridChildMaskWrapper(g, self._data_source), *args, **kwargs)
--> 100             for i in range(self.n_ret): self.retvals[i].append(rv[i])
    101             g.clear_data()
    102         self.retvals = [na.array(self.retvals[i]) for i in range(self.n_ret)]

IndexError: invalid index to scalar variable.