AttributeError: 'PSExact' object has no attribute 'bands'

[zuoshifan]

Error in psestimation.py line 638, see the traceback below.
Also the same error in psmc.py line 126. (AttributeError: 'PSMonteCarloAlt' object has no attribute 'bands')

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Traceback (most recent call last):
File "/home/zuoshifan/.local/bin/drift-makeproducts", line 7, in
execfile(file)
File "/home/zuoshifan/programming/python/21cmcosmology/driftscan/scripts/drift-makeproducts", line 115, in
args.func(args)
File "/home/zuoshifan/programming/python/21cmcosmology/driftscan/scripts/drift-makeproducts", line 13, in run_config
m.generate()
File "/home/zuoshifan/programming/python/21cmcosmology/driftscan/drift/core/manager.py", line 264, in generate
psobj.generate()
File "/home/zuoshifan/programming/python/21cmcosmology/driftscan/drift/core/psestimation.py", line 465, in generate
fisher_bias = mpiutil.parallel_map(self.fisher_bias_m, range(self.telescope.mmax + 1))
File "/home/zuoshifan/programming/python/21cmcosmology/driftscan/drift/util/mpiutil.py", line 92, in parallel_map
return [func(item) for item in glist]
File "/home/zuoshifan/programming/python/21cmcosmology/driftscan/drift/core/psestimation.py", line 405, in fisher_bias_m
fisher, bias = self._work_fisher_bias_m(mi)
File "/home/zuoshifan/programming/python/21cmcosmology/driftscan/drift/core/psestimation.py", line 779, in _work_fisher_bias_m
c_a = self.getproj(mi, ia)
File "/home/zuoshifan/programming/python/21cmcosmology/driftscan/drift/core/psestimation.py", line 733, in getproj
fn = self._cfile % (mi, bi)
File "/home/zuoshifan/programming/python/21cmcosmology/driftscan/drift/core/psestimation.py", line 638, in cfile
return self.psdir + "/ps_c_m" + util.intpattern(self.telescope.mmax) + "b" + util.natpattern(len(self.bands)-1) + ".hdf5"
AttributeError: 'PSExact' object has no attribute 'bands'