```Exception occurred during execution of user config mapping function outer_wrap_fn defined by solid outer_wrap from definition outer_wrap at path root:solids:outer_wrap: Traceback (most recent call last): 
 "/Users/max/dev/dagster/python_modules/dagster/dagster/core/types/evaluator/evaluation.py", line 252, in _evaluate_composite_solid_config frozendict(context.config_value.get('config')), TypeError: outer_wrap_fn() takes 1 positional argument but 2 were given```
Traceback (most recent call last):


 "/oasis/scratch/comet/mkhoshle/temp_project/MPI-traj-split/main1-ga4py-updated-rmsd-chain-reader.py", line 73, in <module>

u = mda.Universe(PSF, XTCs)


 "/home/mkhoshle/miniconda2/envs/ga4py/lib/python2.7/site-packages/MDAnalysis/core/universe.py", line 305, in __init__

self.load_new(coordinatefile, **kwargs)


 "/home/mkhoshle/miniconda2/envs/ga4py/lib/python2.7/site-packages/MDAnalysis/core/universe.py", line 535, in load_new

self.trajectory = reader(filename, **kwargs)


 "/home/mkhoshle/miniconda2/envs/ga4py/lib/python2.7/site-packages/MDAnalysis/coordinates/chain.py", line 123, in __init__

for filename in self.filenames]


 "/home/mkhoshle/miniconda2/envs/ga4py/lib/python2.7/site-packages/MDAnalysis/coordinates/core.py", line 83, in reader

return Reader(filename, **kwargs)


 "/home/mkhoshle/miniconda2/envs/ga4py/lib/python2.7/site-packages/MDAnalysis/coordinates/XDR.py", line 144, in __init__

self._load_offsets()


 "/home/mkhoshle/miniconda2/envs/ga4py/lib/python2.7/site-packages/MDAnalysis/coordinates/XDR.py", line 183, in _load_offsets

data = read_numpy_offsets(fname)


 "/home/mkhoshle/miniconda2/envs/ga4py/lib/python2.7/site-packages/MDAnalysis/coordinates/XDR.py", line 84, in read_numpy_offsets

return {k: v for k, v in six.iteritems(np.load(filename))}


 "/home/mkhoshle/miniconda2/envs/ga4py/lib/python2.7/site-packages/numpy/lib/npyio.py", line 429, in load

"Failed to interpret file %s as a pickle" % repr(file))
IOError: Failed to interpret file '/oasis/scratch/comet/mkhoshle/temp_project/MPI-traj-split/files/.newtraj_41_1.xtc_offsets.npz' as a pickle
