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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def error(self, coro):
 """A decorator that registers a coroutine as a local error handler. A local error handler is an :func:`.on_command_error` event limited to a single command. However, the :func:`.on_command_error` is still invoked afterwards as the catch-all. Parameters coro: :ref:`coroutine <coroutine>` The coroutine to register as the local error handler. Raises ------- TypeError The coroutine passed is not actually a coroutine. """


        if not asyncio.iscoroutinefunction(coro):
            raise TypeError('The error handler must be a coroutine.')

        self.on_error = coro
        return coro