swiki - upload (attach) file bug?

Hi,

I downloaded latest ComSWiki image, created new swiki, but upload
function don't works.

This error occurs:
----
Internal Server Error
MessageNotUnderstood: UndefinedObject>>nextPutAll:
Comanche/6.2 (unix) Server at localhost Port 8888
----

SWiki upload configuration is default.

Any ideas? Thanks, pf