text: class SignError(Exception):
      def __init__(self, **kwargs):
          self.sign = kwargs.get("sign")
          Exception.__init__(self, "Invalid Sign Length: {0}".format(self.sign))
  
  
  class StringLengthError(Exception):
      def __init__(self, **kwargs):
          self.model_name = kwargs.get("model_name")
          Exception.__init__(
              self, "Invalid String Length: {0}".format(self.model_name)
          )
  
  
  class CreateModelError(Exception):
      def __init__(self, **kwargs):
          self.model_name = kwargs.get("model_name")
          Exception.__init__(self, "Create Model Error: {0}".format(self.model_name))
  