Hi everyone, I am trying to implement a multithreaded UDP server in Twisted: from twisted.internet.protocol import DatagramProtocol from twisted.internet import threads, reactor from twisted.python import threadable threadable.init(1) reactor.suggestThreadPoolSize(32) class EchoUDP(DatagramProtocol): def echoDatagram (self, datagram): print datagram def datagramReceived(self, datagram, address): self.transport.write(datagram, address) reactor.callInThread(self.echoDatagram(datagram)) def main(): reactor.listenUDP(8000, EchoUDP()) reactor.run() if __name__ == '__main__': main() although it is working it gives me following error: Traceback (most recent call last): File "C:\Python25\lib\threading.py", line 460, in __bootstrap self.run() File "C:\Python25\lib\threading.py", line 440, in run self.__target(*self.__args, **self.__kwargs) --- <exception caught here> --- File "C:\Python25\lib\site-packages\twisted\python\threadpool.py", line 148, in _worker context.call(ctx, function, *args, **kwargs) File "C:\Python25\lib\site-packages\twisted\python\context.py", line 59, in callWithContext return self.currentContext().callWithContext(ctx, func, *args, **kw) File "C:\Python25\lib\site-packages\twisted\python\context.py", line 37, in callWithContext return func(*args,**kw) exceptions.TypeError: 'NoneType' object is not callable Does anybody know what is wrong? Any help is *greatly* appreciated! ;) Thanks in advance! Cheers Carlo