eladkal commented on pull request #17349:
URL: https://github.com/apache/airflow/pull/17349#issuecomment-961879110
@rounakdatta can you please take a look at the error?
```
ERROR [airflow.models.dagbag.DagBag] Failed to import:
/opt/airflow/airflow/example_dags/tutorial_taskflow_api_etl_virtualenv.py
Traceback (most recent call last):
File "/opt/airflow/airflow/models/dagbag.py", line 331, in
_load_modules_from_file
loader.exec_module(new_module)
File "<frozen importlib._bootstrap_external>", line 850, in exec_module
File "<frozen importlib._bootstrap>", line 228, in
_call_with_frames_removed
File
"/opt/airflow/airflow/example_dags/tutorial_taskflow_api_etl_virtualenv.py",
line 22, in <module>
from airflow.decorators import dag, task
File "/opt/airflow/airflow/decorators/__init__.py", line 20, in <module>
from airflow.decorators.python import PythonDecoratorMixin,
python_task # noqa
File "/opt/airflow/airflow/decorators/python.py", line 21, in <module>
from airflow.operators.python import PythonOperator
File "/opt/airflow/airflow/operators/python.py", line 252, in <module>
class PythonVirtualenvOperator(PythonOperator):
File "/opt/airflow/airflow/operators/python.py", line 341, in
PythonVirtualenvOperator
requirements: Optional[Iterable[str], str] = None,
File "/usr/local/lib/python3.9/typing.py", line 275, in inner
return func(*args, **kwds)
File "/usr/local/lib/python3.9/typing.py", line 352, in __getitem__
return self._getitem(self, parameters)
File "/usr/local/lib/python3.9/typing.py", line 475, in Optional
arg = _type_check(parameters, f"{self} requires a single type.")
File "/usr/local/lib/python3.9/typing.py", line 164, in _type_check
raise TypeError(f"{msg} Got {arg!r:.100}.")
TypeError: typing.Optional requires a single type. Got
(typing.Iterable[str], <class 'str'>).
```
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