A colleague is getting this error when trying to add a large file with ID UK99.zip I'm fairly sure that the file exists. Adding a test file worked OK. Zope Error Zope has encountered an error while publishing this resource. Error Type: NameError Error Value: invalid Troubleshooting Suggestions This resource may be trying to reference a nonexistent object or variable invalid. The URL may be incorrect. The parameters passed to this resource may be incorrect. A resource that this resource relies on may be encountering an error. For more detailed information about the error, please refer to the HTML source for this page. If the error persists please contact the site maintainer. Thank you for your patience. Traceback (innermost last): File C:\Python\devel\Zope\lib\python\ZPublisher\Publish.py, line 214, in publish_module File C:\Python\devel\Zope\lib\python\ZPublisher\Publish.py, line 179, in publish File C:\Python\devel\Zope\lib\python\Zope\__init__.py, line 201, in zpublisher_exception_hook File C:\Python\devel\Zope\lib\python\ZPublisher\Publish.py, line 165, in publish File C:\Python\devel\Zope\lib\python\ZPublisher\mapply.py, line 160, in mapply (Object: manage_addFile) File C:\Python\devel\Zope\lib\python\ZPublisher\Publish.py, line 102, in call_object (Object: manage_addFile) File C:\Python\devel\Zope\lib\python\OFS\Image.py, line 119, in manage_addFile (Object: ElementWithAttributes) File C:\Python\devel\Zope\lib\python\OFS\Image.py, line 239, in manage_upload File C:\Python\devel\Zope\lib\python\OFS\Image.py, line 311, in _read_data File C:\Python\devel\Zope\lib\python\ZODB\Transaction.py, line 237, in commit File C:\python\devel\Zope\lib\python\ZODB\Connection.py, line 300, in commit NameError: (see above) -- Robin Becker