old_contents: class KuyrukError(Exception):
      """Base class for Kuyruk related exceptions."""
      pass
  
  
  class Reject(KuyrukError):
      """
      The task should raise this if it does not want to process the message.
      In this case message will be requeued and delivered to another worker.
  
      """
      pass
  
  
  class ObjectNotFound(KuyrukError):
      """Internal exception that is raised
      when the worker cannot fetch the object of a class task."""
      pass
  
  
  class Timeout(KuyrukError):
      """Raised if a task exceeds it's allowed run time."""
      pass
  
  
  class InvalidTask(KuyrukError):
      """Raised when the message from queue is not valid."""
      pass
  
new_contents: class KuyrukError(Exception):
      """Base class for Kuyruk exceptions."""
      pass
  
  
  class Reject(KuyrukError):
      """
      The task should raise this if it does not want to process the message.
      In this case message will be requeued and delivered to another worker.
  
      """
      pass
  
  
  class ObjectNotFound(KuyrukError):
      """Internal exception that is raised
      when the worker cannot fetch the object of a class task."""
      pass
  
  
  class Timeout(KuyrukError):
      """Raised if a task exceeds it's allowed run time."""
      pass
  
  
  class InvalidTask(KuyrukError):
      """Raised when the received task is not valid."""
      pass
  
subject: update exception docstrings