ClientError Class 
Generic error for a client
Constructor
ClientError()Methods
| add_note | Exception.add_note(note) – add a note to the exception | 
| with_traceback | Exception.with_traceback(tb) – set self.traceback to tb and return self. | 
add_note
Exception.add_note(note) – add a note to the exception
add_note()with_traceback
Exception.with_traceback(tb) – set self.traceback to tb and return self.
with_traceback()