old_contents: # encoding: utf-8
  
  """
  .. codeauthor:: Tsuyoshi Hombashi <gogogo.vm@gmail.com>
  """
  
  from __future__ import absolute_import
  
  
  class ValidationError(Exception):
      """
      Raised when data is not properly formatted.
      """
  
  
  class InvalidTableNameError(ValueError):
      """
      Raised when invalid table name used.
      """
  
  
  class InvalidHeaderNameError(Exception):
      """
      Raised when table header name is invalid.
      """
  
  
  class InvalidFilePathError(ValueError):
      """
      Raised when invalid file path used.
      """
  
  
  class InvalidDataError(ValueError):
      """
      Raised when data is invalid to load.
      """
  
  
  class EmptyDataError(InvalidDataError):
      """
      Raised when data is not included valid table data.
      """
  
  
  class OpenError(IOError):
      """
      Raised when failed to open a file.
      """
  
new_contents: # encoding: utf-8
  
  """
  .. codeauthor:: Tsuyoshi Hombashi <gogogo.vm@gmail.com>
  """
  
  from __future__ import absolute_import
  
  
  class ValidationError(Exception):
      """
      Raised when data is not properly formatted.
      """
  
  
  class InvalidTableNameError(ValueError):
      """
      Raised when invalid table name used.
      """
  
  
  class InvalidHeaderNameError(Exception):
      """
      Raised when table header name is invalid.
      """
  
  
  class InvalidFilePathError(ValueError):
      """
      Raised when invalid file path used.
      """
  
  
  class InvalidDataError(ValueError):
      """
      Raised when data is invalid to load.
      """
  
  
  class EmptyDataError(InvalidDataError):
      """
      Raised when data is not included valid table data.
      """
  
  
  class OpenError(IOError):
      """
      Raised when failed to open a file.
      """
  
  
  class LoaderNotFoundError(Exception):
      """
      Raised when appropriate loader not found.
      """
  
subject: Add LoaderNotFoundError class