I stumbled over a weird error during a package setup, which turned out a PEBCAC error. The full traceback:
[...] File "/home/roman/.buildout/eggs/zope.interface-3.6.3-py2.6-linux-x86_64.egg/zope/interface/adapter.py", line 583, in subscribers subscription(*objects) File "/home/roman/.buildout/eggs/Products.CMFUid-2.2.1-py2.6.egg/Products/CMFUid/UniqueIdAnnotationTool.py", line 86, in handleUidAnnotationEvent uid_handler.unregister(ob) AttributeError: 'NoneType' object has no attribute 'unregister'
I went throught my whole code and type setup unable to find the mistake I’ve made unless I saw the problem. I imported a configuration module for an ArcheTypes content type declaration from a separate package which was not declared in the setup.py of my new package, e.g.:
$ cat my.package.event.py from separate.package.config import PROJECTNAME from plone.directives.form import Schema class IMyType(Schema): ...
If you stumble over this error, make sure your imports are sane.