text: #!/usr/bin/env python3
  
  # Copyright (c) Facebook, Inc. and its affiliates.
  # All rights reserved.
  #
  # This source code is licensed under the BSD-style license found in the
  # LICENSE file in the root directory of this source tree.
  #
  
  
  class CommandParseError(Exception):
      pass
  
  
  class CommandError(Exception):
      pass
  
  
  class UnknownCommand(CommandError):
      pass
  
  
  class ArgsValidationError(Exception):
      pass
  