formencode invalid exception

I am using Formencode and it seems that it throws an uuencoded Invalid
exception and flup seems to have problems with it. I don't notice it
on another server with the same code and same version of Pylons/flup.

Whats the best way to fix this? If I should encode the form "error
message" to utf-8, where and how should I do that?


<type 'exceptions.AssertionError'>	Python 2.5.1: /usr/local/bin/python2.5
Thu Nov 29 11:32:34 2007

A problem occurred in a Python script. Here is the sequence of
function calls leading up to the error, in the order they occurred.
 /opt/abc/build/bdist.freebsd-6.2-RELEASE-amd64/egg/flup/server/scgi_base.py
in run(self=<flup.server.scgi_base.Request object at 0x8d9f82c>)
  183
  184         try:
  185             self._conn.server.handler(self)
  186         except:
  187             self.logger.exception('Exception caught from handler')
 /opt/abc/build/bdist.freebsd-6.2-RELEASE-amd64/egg/flup/server/scgi_base.py
in handler(self=<flup.server.scgi.WSGIServer object at 0x849e8ec>,
request=<flup.server.scgi_base.Request object at 0x8d9f82c>)
  458                     for data in result:
  459                         if data:
  460                             write(data)
  461                     if not headers_sent:
  462                         write('') # in case body was empty
 /opt/abc/build/bdist.freebsd-6.2-RELEASE-amd64/egg/flup/server/scgi_base.py
in write(data=Invalid(u'Please enter an email address',))
  400
  401         def write(data):
  402             assert type(data) is str, 'write() argument must be string'
  403             assert headers_set, 'write() before start_response()'
  404

<type 'exceptions.AssertionError'>: write() argument must be string

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