':param value: message contained in error
:type  value: ``str``
:param http_code: error code
:type  http_code: ``int``
:param extra: extra fields specific to error type
:type  extra: ``list``'

def __init__(self, value, http_code, extra=None):

    self.extra = extra
    super(LiquidWebException, self).__init__(value, http_code, driver=None)
