Hi, As there has not been any upgrades to the debian package, with regards to major versions I decided to have a go at trying to find out the problems with the current released version 4.1.1. I am not the debian maintainer, nor a debian developer. I am working out some details but one thing I have not been able to bypass, and would like some advice : The server fails in : exceptions.RuntimeError: twisted.internet.addressalready loaded, cannot load required backport later other parts fail in : exceptions.AttributeError: 'module' object has no attribute 'backport' See backtrace below [1],[2] I have tried to locate the problem, but I am so far stuck. The __import__("twext") in caldav.py in twisted/plugins is supposed to ensure that twisted get update with the new ipv6 modules that the patches.py in twext is patching ? Loading the twext.backport module dynamically standalone is possible [3]. I run debian sid with Twisted 12.0.0 but as far as I can tell without the ipv6 patches that patches.py checks for. The (wild) ideas I have so far: - Twisted loads twisted.internet.tcp etc before starting caldav in version 12.0.0 ? - The many different modules (groupcacher, caldavd, notifications) race to patch twisted, and once it is done the others fails ? - Some other package that happens to be in the python path confuses caldavd ? I assume it is some simple bug, and if you have a hint to the direction I will try to track it down. It can be that the configuration is out of date, or a version problem with Debian sid. I am trying to upgrade the standard configuration as well. - I also have a vague memory that xmlfile directory is depricated/not up to date/not recommended ? What is best to use for testing ? I am using postgres as data backend and have already patches for debian done (database_bootstrap). If someone wants to help or try the changes I have made so far let me know. Once I have a working package I will post the details. Thank you Fredrik Unger [1] 2012-11-13 17:53:59+0100 [-] LimitingInheritingProtocolFactory starting on 8008 2012-11-13 17:54:00+0100 [-] [groupcacher] Unhandled Error 2012-11-13 17:54:00+0100 [-] [groupcacher] Traceback (most recent call last): 2012-11-13 17:54:00+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twisted/application/app.py", line 647, in run 2012-11-13 17:54:00+0100 [-] [groupcacher] config.parseOptions() 2012-11-13 17:54:00+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twisted/application/app.py", line 614, in parseOptions 2012-11-13 17:54:00+0100 [-] [groupcacher] usage.Options.parseOptions(self, options) 2012-11-13 17:54:00+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twisted/python/usage.py", line 261, in parseOptions 2012-11-13 17:54:00+0100 [-] [groupcacher] for (cmd, short, parser, doc) in self.subCommands: 2012-11-13 17:54:00+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twisted/application/app.py", line 631, in subCommands 2012-11-13 17:54:00+0100 [-] [groupcacher] for plug in sorted(plugins, key=attrgetter('tapname')): 2012-11-13 17:54:00+0100 [-] [groupcacher] --- <exception caught here> --- 2012-11-13 17:54:00+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twisted/plugin.py", line 213, in getPlugins 2012-11-13 17:54:00+0100 [-] [groupcacher] adapted = interface(plugin, None) 2012-11-13 17:54:00+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/zope/interface/interface.py", line 631, in _call_conform 2012-11-13 17:54:00+0100 [-] [groupcacher] return conform(self) 2012-11-13 17:54:00+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twisted/plugin.py", line 68, in __conform__ 2012-11-13 17:54:00+0100 [-] [groupcacher] return self.load() 2012-11-13 17:54:00+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twisted/plugin.py", line 63, in load 2012-11-13 17:54:00+0100 [-] [groupcacher] return namedAny(self.dropin.moduleName + '.' + self.name) 2012-11-13 17:54:00+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twisted/python/reflect.py", line 463, in namedAny 2012-11-13 17:54:00+0100 [-] [groupcacher] topLevelPackage = _importAndCheckStack(trialname) 2012-11-13 17:54:00+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twisted/python/reflect.py", line 400, in _importAndCheckStack 2012-11-13 17:54:00+0100 [-] [groupcacher] return __import__(importName) 2012-11-13 17:54:00+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twisted/plugins/caldav.py", line 17, in <module> 2012-11-13 17:54:00+0100 [-] [groupcacher] __import__("twext") # install patches before doing anything 2012-11-13 17:54:00+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twext/__init__.py", line 21, in <module> 2012-11-13 17:54:00+0100 [-] [groupcacher] from twext import patches 2012-11-13 17:54:00+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twext/patches.py", line 78, in <module> 2012-11-13 17:54:00+0100 [-] [groupcacher] _addBackports() 2012-11-13 17:54:00+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twext/patches.py", line 73, in _addBackports 2012-11-13 17:54:00+0100 [-] [groupcacher] tiname + "already loaded, cannot load required backport") 2012-11-13 17:54:00+0100 [-] [groupcacher] exceptions.RuntimeError: twisted.internet.addressalready loaded, cannot load required backport [2] 2012-11-13 17:54:02+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twisted/python/reflect.py", line 400, in _importAndCheckStack 2012-11-13 17:54:02+0100 [-] [groupcacher] return __import__(importName) 2012-11-13 17:54:02+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twisted/plugins/caldav.py", line 17, in <module> 2012-11-13 17:54:02+0100 [-] [groupcacher] __import__("twext") # install patches before doing anything 2012-11-13 17:54:02+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twext/__init__.py", line 21, in <module> 2012-11-13 17:54:02+0100 [-] [groupcacher] from twext import patches 2012-11-13 17:54:02+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twext/patches.py", line 78, in <module> 2012-11-13 17:54:02+0100 [-] [groupcacher] _addBackports() 2012-11-13 17:54:02+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twext/patches.py", line 68, in _addBackports 2012-11-13 17:54:02+0100 [-] [groupcacher] for submod in backports.iterModules(): 2012-11-13 17:54:02+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twisted/python/modules.py", line 128, in iterModules 2012-11-13 17:54:02+0100 [-] [groupcacher] for placeToLook in self._packagePaths(): 2012-11-13 17:54:02+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twisted/python/modules.py", line 423, in _packagePaths 2012-11-13 17:54:02+0100 [-] [groupcacher] load = self.load() 2012-11-13 17:54:02+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twisted/python/modules.py", line 383, in load 2012-11-13 17:54:02+0100 [-] [groupcacher] return self.pathEntry.pythonPath.moduleLoader(self.name) 2012-11-13 17:54:02+0100 [-] [groupcacher] File "/usr/lib/python2.7/dist-packages/twisted/python/reflect.py", line 474, in namedAny 2012-11-13 17:54:02+0100 [-] [groupcacher] obj = getattr(obj, n) 2012-11-13 17:54:02+0100 [-] [groupcacher] exceptions.AttributeError: 'module' object has no attribute 'backport' [3] Python 2.7.3 (default, Sep 9 2012, 17:41:34) [GCC 4.7.1] on linux2 Type "help", "copyright", "credits" or "license" for more information.

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__import__("twext") <module 'twext' from 'twext/__init__.pyc'> o= __import__("twext") ob = getattr(o, 'backport') print ob <module 'twext.backport' from 'twext/backport/__init__.pyc'>