old_contents: """Custom error for invalid yaml file."""
  
  from .Error import Error
  
  ERROR_MESSAGE = """
  Invalid YAML file (.yaml)
  
  Options:
    - Does the file match the expected layout?
    - Does the file contain at least one key:value pair?
    - Is the syntax correct? (are you missing a colon somewhere?)
  """
  
  
  class InvalidYAMLFileError(Error):
      """custom error for invalid yaml file."""
  
      def __init__(self, yaml_file_path):
          """Create error for invalid yaml file."""
          super().__init__()
          self.yaml_file_path = yaml_file_path
  
      def __str__(self):
          """Override default error string.
  
          Returns:
              Error message for invalid yaml file.
          """
          return self.base_message.format(filename=self.yaml_file_path) + ERROR_MESSAGE
  
new_contents: """Custom error for invalid yaml file."""
  
  from .Error import Error
  
  ERROR_MESSAGE = """
  Invalid YAML file (.yaml).
  
  Options:
    - Does the file match the expected layout?
    - Does the file contain at least one key:value pair?
    - Is the syntax correct? (are you missing a colon somewhere?)
  """
  
  
  class InvalidYAMLFileError(Error):
      """custom error for invalid yaml file."""
  
      def __init__(self, yaml_file_path):
          """Create error for invalid yaml file."""
          super().__init__()
          self.yaml_file_path = yaml_file_path
  
      def __str__(self):
          """Override default error string.
  
          Returns:
              Error message for invalid yaml file.
          """
          return self.base_message.format(filename=self.yaml_file_path) + ERROR_MESSAGE
  
subject: Fix typo in error message