[Zope] - hmm

[David Ascher]

I'm getting a fair bit of messages like:

Traceback (innermost last):
  File d:\local\src\Zope\lib\python\ZPublisher\Publish.py, line 860, in
publish_module
  File d:\local\src\Zope\lib\python\ZPublisher\Publish.py, line 582, in
publish
    (Info: /make_piechart)
  File
d:\local\src\Zope\lib\python\Products\ExternalMethod\ExternalMethod.py,
line 254, in __call__
    (Object: Item)
    (Info: ((<Application instance at 0092CB70>, Response('')), {}, None))
TypeError: read-only character buffer, class

when trying to look at images returned by external methods, in a frame
which shows a 'broken picture' icon.  What does it mean?

--david