Hi, I would like to fix pydoctor / epydocs errors generated while building twisted api reference documentation. The goal is to have a clean build so that when a developer sees an error in his/her branch, the errors is for sure produced by his/her changes. My current problem is that I can not reproduce the results generated by Twisted buildbot. For example for pair, Twisted buildbot gives [1]: twisted.pair.tuntap._IInputOutputSystem.ioctl:143 invalid ref to fcntl.ioctl twisted.pair.tuntap._IInputOutputSystem.ioctl:143 invalid ref to fcntl.ioctl twisted.pair.testing.MemoryIOSystem.ioctl:442 invalid ref to fcntl.ioctl twisted.pair.testing.MemoryIOSystem.ioctl:442 invalid ref to fcntl.ioctl While on Travis-CI builder, and my local system I get [2]: twisted.pair.testing.MemoryIOSystem.receiveUDP:494 invalid ref to socket.socket twisted.pair.testing.MemoryIOSystem.receiveUDP:494 invalid ref to socket.socket twisted.pair.testing._FakePort.recv:527 invalid ref to socket.socket.recv twisted.pair.testing._FakePort.recv:527 invalid ref to socket.socket.recv twisted.pair.testing._FakePort.recv:527 invalid ref to socket.socket.recv twisted.pair.testing._FakePort.recv:527 invalid ref to socket.socket.recv twisted.pair.tuntap._IInputOutputSystem.receiveUDP:182 invalid ref to socket.socket twisted.pair.tuntap._IInputOutputSystem.receiveUDP:182 invalid ref to socket.socket ----- The command used is python bin/admin/build-apidocs . apidocs Does anyone has any clue what can go wrong and why I get this differences ? Thanks! [1] https://travis-ci.org/chevah/twisted/jobs/19809459 [2] http://buildbot.twistedmatrix.com/builders/documentation/builds/4469/steps/a... -- Adi Roiban