issue about "ukdale.h5"

[edsml-jz2321]

When I use "ukdale.h5" to replace "redd.h5" in "nilmtk-master/docs/outdated/NILM_Workshop_2014_demo.ipynb", I get some error when I execute the code below, does anyone know how to solve it? Thanks!

##my code
##Disaggregate
disag_filename = join(data_dir, 'ukdale.h5')
output = HDFDataStore(disag_filename, 'r')
co.disaggregate(elec.mains(), output)
output.close()

##my print

ValueError Traceback (most recent call last)
in
3 disag_filename = join(data_dir, 'ukdale.h5')
4 output = HDFDataStore(disag_filename, 'r')
----> 5 co.disaggregate(elec.mains(), output)
6 output.close()

~/miniconda3/envs/NILM/lib/python3.6/site-packages/nilmtk/legacy/disaggregate/combinatorial_optimisation.py in disaggregate(self, mains, output_datastore, **load_kwargs)
164 columns=cols)
165 key = '{}/elec/meter{}'.format(building_path, meter_instance)
--> 166 output_datastore.append(key, df)
167
168 # Copy mains data to disag output

~/miniconda3/envs/NILM/lib/python3.6/site-packages/nilmtk/docinherit.py in f(*args, **kwargs)
51 def f(*args, **kwargs):
52 if obj:
---> 53 return self.mthd(obj, *args, **kwargs)
54 else:
55 return self.mthd(*args, **kwargs)

~/miniconda3/envs/NILM/lib/python3.6/site-packages/nilmtk/datastore/hdfdatastore.py in append(self, key, value)
162 data in the table, so be careful.
163 """
...
-> 3309 f"invalid combination of [{c}] on appending data "
3310 f"[{sax}] vs current table [{oax}]"
3311 )

ValueError: invalid combination of [values_axes] on appending data [name->values_block_0,cname->values_block_0,dtype->float32,kind->float,shape->(1, 4320)] vs current table [name->values_block_0,cname->values_block_0,dtype->b'float32',kind->float,shape->None]