YML file parsing issue

[pandaaditi91-1]

Hello, I'm running this on Google Colab.
It is showing there's an unexpected : (colon) in line no. 8 of the train.yml file - where MODEL.MODE has been defined.
But there is no syntax error there. The error:

**`Traceback (most recent call last):
  File "/usr/local/lib/python3.10/dist-packages/config/__init__.py", line 803, in load
    items = p.container()
  File "/usr/local/lib/python3.10/dist-packages/config/parser.py", line 292, in container
    result = self.mapping_body()
  File "/usr/local/lib/python3.10/dist-packages/config/parser.py", line 195, in mapping_body
    raise pe
config.parser.ParserError: Unexpected ':' at (8, 7)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/content/Real-Fundus/./train_code/train.py", line 3, in <module>
    opt = Config('/content/Real-Fundus/train_code/train.yml')
  File "/usr/local/lib/python3.10/dist-packages/config/__init__.py", line 707, in __init__
    self.load_file(stream_or_path, kwargs.get('encoding'))
  File "/usr/local/lib/python3.10/dist-packages/config/__init__.py", line 816, in load_file
    self.load(f)
  File "/usr/local/lib/python3.10/dist-packages/config/__init__.py", line 807, in load
    raise cfe
config.ConfigFormatError: Unexpected ':' at (8, 7)`**

Tried googling it but unable to find any solution. Please help.