AttributeError: StringIO instance has no attribute

Hi

It seems all of a sudden some files on my website are no loner accessible. They have been working before.

I get these exception details:

Time

    08-11-2006 09:19

User Name

    jo1hpc (jo1hpc)

Request URL

    http://jus.shef.ac.uk/module-info/level-3/JNL314/module_outlines_06-07.doc/index_html

Exception Type

    AttributeError

Exception Value

    StringIO instance has no attribute 'index_html'

Traceback (innermost last):

    * Module ZPublisher.Publish, line 114, in publish

    * Module ZPublisher.mapply, line 88, in mapply

    * Module ZPublisher.Publish, line 40, in call_object

    * Module Products.ATContentTypes.content.file, line 114, in index_html

    * Module Products.Archetypes.Field, line 1106, in download

    * Module Products.ExternalStorage.filewrapper, line 72, in __getattr__

AttributeError: StringIO instance has no attribute 'index_html' 

Traceback (innermost last):

  Module ZPublisher.Publish, line 114, in publish

  Module ZPublisher.mapply, line 88, in mapply

  Module ZPublisher.Publish, line 40, in call_object

  Module Products.ATContentTypes.content.file, line 114, in index_html

  Module Products.Archetypes.Field, line 1106, in download

  Module Products.ExternalStorage.filewrapper, line 72, in __getattr__

AttributeError: StringIO instance has no attribute 'index_html'

The only thing I've done recently (a few weeks ago) is installing PloneZipFiles

Thanks