O forum do curso de DataScience de pandas está desativado, não consigo fazer perguntas!! Estou tendo um erro e nao consigo solucionar, preciso de ajuda!

matriculas.groupby('id_curso').count().join(cursos['nome_do_curso'])

---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
~\Documents\Anaconda3\lib\site-packages\pandas\core\indexes\base.py in get_loc(self, key, method, tolerance)
   3802             try:
-> 3803                 return self._engine.get_loc(casted_key)
   3804             except KeyError as err:

~\Documents\Anaconda3\lib\site-packages\pandas\_libs\index.pyx in pandas._libs.index.IndexEngine.get_loc()

~\Documents\Anaconda3\lib\site-packages\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: 'nome_do_curso'

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

KeyError                                  Traceback (most recent call last)
~\AppData\Local\Temp\ipykernel_1940\3003734164.py in <module>
----> 1 matriculas.groupby('id_curso').count().join(cursos['nome_do_curso'])

~\Documents\Anaconda3\lib\site-packages\pandas\core\frame.py in __getitem__(self, key)
   3802             if self.columns.nlevels > 1:
   3803                 return self._getitem_multilevel(key)
-> 3804             indexer = self.columns.get_loc(key)
   3805             if is_integer(indexer):
   3806                 indexer = [indexer]

~\Documents\Anaconda3\lib\site-packages\pandas\core\indexes\base.py in get_loc(self, key, method, tolerance)
   3803                 return self._engine.get_loc(casted_key)
   3804             except KeyError as err:
-> 3805                 raise KeyError(key) from err
   3806             except TypeError:
   3807                 # If we have a listlike key, _check_indexing_error will raise

KeyError: 'nome_do_curso

Tentei de todas as formas remover este erro mas nao consigo! Preciso de ajuda!