TypeError: 'NoneType' object is not callable
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['Hi, @Chenfei-Kang.\r\n\r\nI\'m sorry, but I\'m not able to reproduce your bug:\r\n```python\r\nfrom datasets import load_dataset\r\n\r\nds = load_dataset("glue", \'cola\')\r\nds\r\n```\r\n```\r\nDatasetDict({\r\n    train: Dataset({\r\n        features: [\'sentence\', \'label\', \'idx\'],\r\n        num_rows: 8551\r\n    })\r\n    validation: Dataset({\r\n        features: [\'sentence\', \'label\', \'idx\'],\r\n        num_rows: 1043\r\n    })\r\n    test: Dataset({\r\n        features: [\'sentence\', \'label\', \'idx\'],\r\n        num_rows: 1063\r\n    })\r\n})\r\n```\r\n\r\nCould you please give more details and environment info (platform, PyArrow version)?'
 '> Hi, @Chenfei-Kang.\r\n> \r\n> I\'m sorry, but I\'m not able to reproduce your bug:\r\n> \r\n> ```python\r\n> from datasets import load_dataset\r\n> \r\n> ds = load_dataset("glue", \'cola\')\r\n> ds\r\n> ```\r\n> \r\n> ```\r\n> DatasetDict({\r\n>     train: Dataset({\r\n>         features: [\'sentence\', \'label\', \'idx\'],\r\n>         num_rows: 8551\r\n>     })\r\n>     validation: Dataset({\r\n>         features: [\'sentence\', \'label\', \'idx\'],\r\n>         num_rows: 1043\r\n>     })\r\n>     test: Dataset({\r\n>         features: [\'sentence\', \'label\', \'idx\'],\r\n>         num_rows: 1063\r\n>     })\r\n> })\r\n> ```\r\n> \r\n> Could you please give more details and environment info (platform, PyArrow version)?\r\n\r\nSorry to reply you so late.\r\nplatform: pycharm 2021 + anaconda with python 3.7\r\nPyArrow version: 5.0.0\r\nhuggingface-hub: 0.0.16\r\ndatasets: 1.9.0\r\n'
 "- For the platform, we need to know the operating system of your machine. Could you please run the command `datasets-cli env` and copy-and-paste its output below?\r\n- In relation with the error, you just gave us the error type and message (`TypeError: 'NoneType' object is not callable`). Could you please copy-paste the complete stack trace, so that we know exactly which part of the code threw the error?"
 '> * For the platform, we need to know the operating system of your machine. Could you please run the command `datasets-cli env` and copy-and-paste its output below?\r\n> * In relation with the error, you just gave us the error type and message (`TypeError: \'NoneType\' object is not callable`). Could you please copy-paste the complete stack trace, so that we know exactly which part of the code threw the error?\r\n\r\n1. For the platform, here are the output:\r\n        - datasets` version: 1.11.0\r\n        - Platform: Windows-10-10.0.19041-SP0\r\n        - Python version: 3.7.10\r\n        - PyArrow version: 5.0.0\r\n2. For the code and error：\r\n     ```python\r\n     from datasets import load_dataset, load_metric\r\n     dataset = load_dataset("glue", "cola")\r\n    ```\r\n    ```python\r\n    Traceback (most recent call last):\r\n    ....\r\n    ....\r\n    File "my_file.py", line 2, in <module>\r\n    dataset = load_dataset("glue", "cola")\r\n    File "My environments\\lib\\site-packages\\datasets\\load.py", line 830, in load_dataset\r\n    **config_kwargs,\r\n     File "My environments\\lib\\site-packages\\datasets\\load.py", line 710, in load_dataset_builder\r\n    **config_kwargs,\r\n    TypeError: \'NoneType\' object is not callable\r\n    ```\r\n   Thank you!'
 "For that environment, I am sorry but I can't reproduce the bug: I can load the dataset without any problem."
 'One naive question: do you have internet access from the machine where you execute the code?'
 "> For that environment, I am sorry but I can't reproduce the bug: I can load the dataset without any problem.\r\n\r\nBut I can download other task dataset such as `dataset = load_dataset('squad')`. I don't know what went wrong.  Thank you so much!"
 'Hi,friends. I meet the same problem. Do you have a way to fix this? Thanks!\r\n']
## Describe the bug

TypeError: 'NoneType' object is not callable
## Steps to reproduce the bug
```python
from datasets import load_dataset, load_metric
dataset = datasets.load_dataset("glue", 'cola')
```

## Expected results
A clear and concise description of the expected results.

## Actual results
Specify the actual results or traceback.

## Environment info
<!-- You can run the command `datasets-cli env` and copy-and-paste its output below. -->
- `datasets` version: 1.11.0
- Platform:
- Python version: 3.7
- PyArrow version:

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