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                        - from services.errors.base import BaseServiceError
 - 
 - 
 - class LastConversationNotExistsError(BaseServiceError):
 -     pass
 - 
 - 
 - class ConversationNotExistsError(BaseServiceError):
 -     pass
 - 
 - 
 - class ConversationCompletedError(Exception):
 -     pass
 
 
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