How to use the acquisition.tomviz.jsonrpc.__init__.MethodNotFound function in Acquisition

def __init__(self, message='Method not found.', data=None):
        super(MethodNotFound, self).__init__(METHOD_NOT_FOUND, message, data)

def rpc(self, request):

        jsonrpc = request.get('jsonrpc')
        id = request.get('id')
        method = request.get('method')
        params = request.get('params', {})

        try:
            if jsonrpc != JSONRPC_VERSION or id is None or method is None:
                raise InvalidRequest()

            if method not in self._methods:
                msg = 'Method "%s" not found.' % method
                raise MethodNotFound(message=msg, data=method)

            func = self._methods[method]

            try:
                if isinstance(params, list):
                    result = func(*params)
                elif isinstance(params, dict):
                    result = func(**params)
                else:
                    raise InvalidParams()
            except ValueError as vex:
                raise InvalidParams(message=str(vex),
                                    data=json.dumps(traceback.format_exc()))
            except Exception as ex:
                raise ServerError(message=str(ex),
                                  data=json.dumps(traceback.format_exc()))