day_date               cabinet_name   ...     epoch_time  sum_pwr
0  2017-01-01   US.PRZ.03.01.2200.03.001   ...     1483228800   2.3368
1  2017-01-01   US.PRZ.03.01.2200.03.002   ...     1483228800   4.6188
2  2017-01-01   US.PRZ.03.01.2200.03.003   ...     1483228800   2.2688
3  2017-01-01   US.PRZ.03.01.2200.03.004   ...     1483228800   2.1966
4  2017-01-01   US.PRZ.03.01.2200.03.005   ...     1483228800   2.2108

[5 rows x 5 columns]
[####################################    ] | 92% Completed |  0.4s
Exception in thread Thread-2:
Traceback (most recent call last):
  File "/usr/local/Cellar/python@2/2.7.15/Frameworks/Python.framework/Versions/2.7/lib/python2.7/threading.py", line 801, in __bootstrap_inner
    self.run()
  File "/usr/local/Cellar/python@2/2.7.15/Frameworks/Python.framework/Versions/2.7/lib/python2.7/threading.py", line 754, in run
    self.__target(*self.__args, **self.__kwargs)
  File "amrith_code.py", line 103, in do_work
    df6 = df6.append(process_file(df).compute())
  File "amrith_code.py", line 78, in process_file
    print (df3.head())
  File "/usr/local/lib/python2.7/site-packages/dask/dataframe/core.py", line 908, in head
    result = result.compute()
  File "/usr/local/lib/python2.7/site-packages/dask/base.py", line 156, in compute
    (result,) = compute(self, traverse=False, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/dask/base.py", line 400, in compute
    results = schedule(dsk, keys, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/dask/threaded.py", line 75, in get
    pack_exception=pack_exception, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/dask/local.py", line 521, in get_async
    raise_exception(exc, tb)
  File "/usr/local/lib/python2.7/site-packages/dask/local.py", line 290, in execute_task
    result = _execute_task(task, data)
  File "/usr/local/lib/python2.7/site-packages/dask/local.py", line 271, in _execute_task
    return func(*args2)
  File "/usr/local/lib/python2.7/site-packages/dask/dataframe/core.py", line 3558, in apply_and_enforce
    raise ValueError("The columns in the computed data do not match"
ValueError: The columns in the computed data do not match the columns in the provided metadata