KeyError: 'RAW DATE'

[doricardo-zz]

Describe the bug
When using the timeseries on COVID19 datasets, i've got error:

---

KeyError Traceback (most recent call last)
/usr/local/lib/python3.7/dist-packages/pandas/core/indexes/base.py in get_loc(self, key, method, tolerance)
2897 try:
-> 2898 return self._engine.get_loc(casted_key)
2899 except KeyError as err:

pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc()

pandas/_libs/index.pyx in pandas._libs.index.IndexEngine.get_loc()

pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item()

pandas/_libs/hashtable_class_helper.pxi in pandas._libs.hashtable.PyObjectHashTable.get_item()

KeyError: 'RAW DATE'

The above exception was the direct cause of the following exception:

KeyError Traceback (most recent call last)
3 frames
/usr/local/lib/python3.7/dist-packages/pandas/core/indexes/base.py in get_loc(self, key, method, tolerance)
2898 return self._engine.get_loc(casted_key)
2899 except KeyError as err:
-> 2900 raise KeyError(key) from err
2901
2902 if tolerance is not None:

KeyError: 'RAW DATE'

Desktop (please complete the following information):
Google Colab
OS: Windows10
Browser Google Chrome
Version 90.0.4430.93 (Versão oficial) 64 bits