Sections

Error References

Error reference section.

Frequently encountered

2.1.x -> 2.5.2: Error value: 'NoneType' object has no attribute 'addMember': When Migrating from 2.1.3 or 2.1.4 to 2.5.2, some Plone instances may raise the error: Error value: 'NoneType' object has no attribute 'addMember'
DeprecationWarning: Example: DeprecationWarning: The XYZ parameter of XYZ is deprecated and will be ignored in CMF X.Y: XYZ
EmergencyUserCannotOwn: When trying to add an object in your Zope instance, you get "EmergencyUserCannotOwn".
Insufficient privileges: When you get an Unauthorized exception ("Insufficient privileges"), it's often difficult to determine exactly which permission is causing the problem. Enter VerboseSecurity.
PTRuntimeError: FS Page Template my_template has errors: This error normally occurs when you have a syntax error or HTML error in your template. Here's how to troubleshoot and fix it.
python.exe Unable to locate Component - pywintypes23.dll not found: python.exe Unable to locate Component - [..] pywintypes23.dll not found [..]
SyntaxError: 'return' outside function: In a Plone context, you can see this error while running Buildout.
Unauthorized: Not authorized to access binding: context: How to find out the REAL source of the dreaded "Not authorized to access binding: context" error.

General

'group_' Error when assigning roles to users and/or groups: This error occurs when attempting to assign Roles to Groups in Plone 2.0.x when using the Debian packages for Plone installation/maintenance or you're using GRUF3.
'isPrincipiaFolderish' of None, acquired through (Products): Skin rendering fails and hiddenStructure becomes visible. Plone default styles are missing, because Plone default CSS seems to be not used. If one runs in debug mode, an exception traceback is available in event.log.
'str' object has no value 'getId' (using PasswordResetTool and CMFMember): When a user registers on the site, if they tick 'Send me a copy of my password' - they get an error.
AttributeError regarding NoneType in Catalog Results: While using .getObject() on a brain (the values returned by a catalog search result) a NoneType can be returned. This will cause an AttributeError in Zope 2.7; in Zope 2.8 it raises an exception either KeyError or AttributeError immedaitely.
AttributeError related to getGroups or getLocalRolesForDisplay: This error is normally caused by the lack of a Group User Folder.
AttributeError: 'module' object has no attribute 'flock': If you try installing Plone on an IBM Thinkpad or PC, its Python install conflicts with the Plone one.
AttributeError: _length: When you upgrade from Zope 2.7.x to 2.8.1 you get this error on most of the portal_catalog operations.
AttributeError: getBodyTagClass: If you customize 'main_template' and get an AttributeError on 'getBodyTagClass' you have probably customized the wrong 'main_template'.
AttributeError: manage_addTool: AttributeError: manage_addTool exception is thrown when trying to quick install a new product
AttributeError: navigation_properties: When installing a product in Plone you get: AttributeError: navigation_properties
AttributeError: toPortalTime: In Plone 2.1.2 or 2.5 you get an error message: AttributeError: toPortalTime
Class declaration fails and complains about number of arguments: For example: class Record(BaseBTreeFolder): TypeError: function takes at most 2 arguments (3 given)
Copy Error: Copy errors may occur when a Plone user adds a Zope folder through the ZMI and attempts to paste Plone objects inside that folder
Copy Error on Import: You get a Copy Error when trying to import an object.
function attributes not accessible in restricted mode: The error "function attributes not accessible in restricted mode" means you're operating on a function when you think you're operating on the result of calling that function.
Functional testing: The object at x has an empty or missing docstring.: You get error "Zope has encountered a problem publishing your object. The object at x has an empty or missing docstring."
Gaierror: Gaierrors occur when the server network services are not correctly configured or when a firewall is blocking nameserver lookups.
ImportError: No module named ImplPython: Plone instance does not start or running unit tests fails with Python exception: ImportError: No module named ImplPython
IndexError: list index out of range: createObject raises strange IndexError: list index out of range
Infinite Recursion Error (Catalog): When I catalog an object I sometimes get a infinite recursion error. Why?
Infinite recursion error: __call__() in Plone 2.1: After importing content into a plone 2.1 site you get an 'Infinite recursion' error related to PortalContent.__call__() displayed when trying to view the imported content
Internet Explorer - 500 internal server error, even on localhost: IE becomes unable to 'see' your plone server via localhost or any URI, but other browsers see the server fine.
Internet Explorer: Can't download files over https: IE protests that it cannot find the file you are attempting to download. This occurs when you are using https and have cache control headers set (for instance if you're using CacheFu).
InvalidObjectReference: InvalidObjectReference - Error Value: Attempt to store an object from a foreign database connection.
IOError: decoder jpeg not available: You've installed the Python Imaging Libraries (PIL). Yet when you upload or manipulate an image, you get the error message: IOError: decoder jpeg not available.
KeyError: This error appears when you're trying to access something that doesn't exist in an attribute.
KeyError during restrictedTraverse: Page template engine is unable to find files. KeyError occuring during restrictedTraverse. E.g. KeyError: 'field'.
KeyError: 'ACTUAL_URL' (Also, an error occurred while attempting to render the standard error message.): If Plone 2.1 fails to render immediately upon installation, you are probably running a Zope version prior to 2.7.4. Upgrading will fix the problem
KeyError: 'main_template': Error occurring when you attempt to view any context that calls main_tempate
log() got an unexpected keyword argument 'error': This error shows up on systems using access rules running a particular Zope version with Plone.
Members Can't Create Folders Through WebDAV: Using a WebDAV client on a Plone site, sitre users are unable to create new folders directories where they have Owner role.
Nested page template errors: If you have a page template which uses a macro, and the page template which defines the macro has an error, it's difficult to track down the error.
No such file or directory: 'images/version.gif': When launching Zope in debug mode, Zope refuses to start because of broken product OFSP. Traceback claims that image file is missing.
Permission denied: ... .python-eggs: Product installation failure due to failure to create egg cache
Portal content has gone missing: Plone doesn't show any content though everything seem to be present when you view your site structure through Zope Management Interface
POSKeyError: POSKeyError means that you have an error in your database, and appears when you have database corruption.
Product's initialize() is not called in unit tests: A product's initialize() in __init__.py is not called in unit testing, leading to all sorts of missing type errors
Python crashes on Mac OS X (lxml related): The famous lxml crash, and what to do about it
Quick installer doesn't find a product: You have copied a new product to Plone's Products folder, but the quick installer cannot find it.
RichWidget fails to format text in view mode: RichWidget doesn't format text in view mode but displays it as plain text
RuntimeError: Shouldn't load state: RuntimeError: Shouldn't load state for 00000000002a028d when the connection is closed (Also, an error occurred while attempting to render the standard error message.
Setup error: Executing command setupSite.pyfailed (MimeTypes error): When setting up Plone on Windows XP, an error is encountered while executing the setupSite.py script. The error lies within the MimeTypes script and produces the following message: Executing the command setupSite.py' failed. Index error: String index out of range.
StorageError: Quota Exceeded: During testing, if the necessary memory exceeds 1MB, the tests will run.
The bucket being iterated changed size: This is a problem that existed in the sessioning machinery in Zope 2.7.x
TypeError: argument 1 must be string in constructor: TypeError: argument 1 must be string, not YourTool A construtor seems to take string argument instead of self.
TypeError: get_field() takes exactly 2 arguments (3 given): A common error when the API has changed.
TypeError: iteration over non-sequence: Cannot view the site after moving Data.fs to a new server
Unauthorized: The owner of the executing script is defined outside the context of the object being accessed. The script has proxy roles, but they do not apply in this context.: You did everything you could to make sure your workflow script has the necessary permissions to do what it needs to do and it still does not work? Check this
Unauthorized: You are not allowed to access 'xxx.yyy' in this context: When creating a new item the user cannot get to the initial edit page
validateSingleEmailAddress: You may encounter this error when registering new members. It will cause the registering to fail.
ValueError: Cache values may only be in one cache.: This is a low-level ZODB error that may sometimes happen when you refresh a Product without restarting Zope. It therefore is almost never seen in production. Restart will fix it.
WebDAV tests on Mac: If you get a failure on testPUTImageICONoContentType, on a Mac this is the resolution.

Archetypes

Attribute Error: archetype_tool / mimetype_registry / reference_catalog: After re- or uninstalling an Archetypes-related Product, this error can appear. AttributeErrors for mimetype_registry or reference_catalog may also be symptoms of the same problem.
AttributeError: 'NoneType' object has no attribute 'keys': I got this error when switching between OrderedBaseFolder and a BTree-based equivalent in Archetypes, the actual error can be a lot of things, but thought I would document this particular instance of it here.
AttributeError: reference_catalog: When adding Archetype field to python property bridges, be careful with ReferenceFields - they must be ATReferenceFieldProperty, not ATFieldProperty.
AttributeError: test_user_1_: Unit tests fail when trying create content using invokeFactory() on Plone 2.5.1/Zope 2.9.4
Cache values may only be in one cache: Cache values may only be in one cache when developing product
Field Accessor yields None: Name clashes of accessors and methods inherited from base classes are not caught.
IndexError: list index out of range: createObject raises strange IndexError: list index out of range
MimeTypeException: Malformed MIME type (t): Exception occurs when you try to view/edit your Archetypes object: MimeTypeException: Malformed MIME type (t)
python.exe Unable to locate Component - pywintypes23.dll not found: python.exe Unable to locate Component - [..] pywintypes23.dll not found [..]
TypeError: unsubscriptable object: "Type Error: unsubscriptable object" occurs in an Archetypes based object after pressing the save button of the base_edit form.
Uploaded images aren't shown in view/ aren't resized: An image uploaded in an Archetypes-based object shows only up in the 'Edit' form (in original size) and do not show up (resized) in the 'View'.
ValueError: Cache values may only be in one cache.: This is a low-level ZODB error that may sometimes happen when you refresh a Product without restarting Zope. It therefore is almost never seen in production. Restart will fix it.