Sometimes when I try to edit a page, I get this in plain text.  Does
anyone know what this is?

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/trac/web/api.py", line 376,
in send_error
    'text/html')
  File "/usr/lib/python2.6/dist-packages/trac/web/chrome.py", line
773, in render_template
    stream.render(method, doctype=doctype, out=buffer)
  File "/usr/lib/pymodules/python2.6/genshi/core.py", line 179, in
render
    return encode(generator, method=method, encoding=encoding,
out=out)
  File "/usr/lib/pymodules/python2.6/genshi/output.py", line 61, in
encode
    for chunk in iterator:
  File "/usr/lib/pymodules/python2.6/genshi/output.py", line 311, in
__call__
    for kind, data, pos in stream:
  File "/usr/lib/pymodules/python2.6/genshi/output.py", line 753, in
__call__
    for kind, data, pos in stream:
  File "/usr/lib/pymodules/python2.6/genshi/output.py", line 592, in
__call__
    for kind, data, pos in stream:
  File "/usr/lib/pymodules/python2.6/genshi/output.py", line 698, in
__call__
    for kind, data, pos in chain(stream, [(None, None, None)]):
  File "/usr/lib/pymodules/python2.6/genshi/output.py", line 532, in
__call__
    for ev in stream:
  File "/usr/lib/pymodules/python2.6/genshi/core.py", line 283, in
_ensure
    for event in stream:
  File "/usr/lib/pymodules/python2.6/genshi/core.py", line 283, in
_ensure
    for event in stream:
  File "/usr/lib/python2.6/dist-packages/trac/web/chrome.py", line
838, in _strip_accesskeys
    for kind, data, pos in stream:
  File "/usr/lib/pymodules/python2.6/genshi/core.py", line 283, in
_ensure
    for event in stream:
  File "/usr/lib/python2.6/dist-packages/trac/web/chrome.py", line
827, in _generate
    for kind, data, pos in stream:
  File "/usr/lib/pymodules/python2.6/genshi/template/base.py", line
569, in _include
    for event in stream:
  File "/usr/lib/pymodules/python2.6/genshi/template/markup.py", line
298, in _match
    ctxt, start=idx + 1, **vars):
  File "/usr/lib/pymodules/python2.6/genshi/template/markup.py", line
298, in _match
    ctxt, start=idx + 1, **vars):
  File "/usr/lib/pymodules/python2.6/genshi/template/markup.py", line
245, in _match
    for event in stream:
  File "/usr/lib/pymodules/python2.6/genshi/template/base.py", line
543, in _exec
    for event in stream:
  File "/usr/lib/pymodules/python2.6/genshi/template/base.py", line
533, in _eval
    for event in substream:
  File "/usr/lib/pymodules/python2.6/genshi/template/base.py", line
496, in _eval
    for kind, data, pos in stream:
  File "/usr/lib/pymodules/python2.6/genshi/template/base.py", line
551, in _flatten
    for event in stream:
  File "/usr/lib/pymodules/python2.6/genshi/core.py", line 283, in
_ensure
    for event in stream:
  File "/usr/lib/pymodules/python2.6/genshi/path.py", line 141, in
_generate
    subevent = stream.next()
  File "/usr/lib/pymodules/python2.6/genshi/template/base.py", line
569, in _include
    for event in stream:
  File "/usr/lib/pymodules/python2.6/genshi/template/markup.py", line
234, in _strip
    event = stream.next()
  File "/usr/lib/pymodules/python2.6/genshi/template/base.py", line
543, in _exec
    for event in stream:
  File "/usr/lib/pymodules/python2.6/genshi/template/base.py", line
533, in _eval
    for event in substream:
  File "/usr/lib/pymodules/python2.6/genshi/template/base.py", line
496, in _eval
    for kind, data, pos in stream:
  File "/usr/lib/pymodules/python2.6/genshi/template/base.py", line
551, in _flatten
    for event in stream:
  File "/usr/lib/pymodules/python2.6/genshi/core.py", line 283, in
_ensure
    for event in stream:
  File "/usr/lib/pymodules/python2.6/genshi/path.py", line 141, in
_generate
    subevent = stream.next()
  File "/usr/lib/pymodules/python2.6/genshi/template/base.py", line
569, in _include
    for event in stream:
  File "/usr/lib/pymodules/python2.6/genshi/template/markup.py", line
234, in _strip
    event = stream.next()
  File "/usr/lib/pymodules/python2.6/genshi/template/base.py", line
543, in _exec
    for event in stream:
  File "/usr/lib/pymodules/python2.6/genshi/template/base.py", line
533, in _eval
    for event in substream:
  File "/usr/lib/pymodules/python2.6/genshi/template/base.py", line
496, in _eval
    for kind, data, pos in stream:
  File "/usr/lib/pymodules/python2.6/genshi/template/base.py", line
557, in _flatten
    **vars)
  File "/usr/lib/pymodules/python2.6/genshi/template/base.py", line
272, in _apply_directives
    stream = directives[0](iter(stream), directives[1:], ctxt, **vars)
  File "/usr/lib/pymodules/python2.6/genshi/template/directives.py",
line 411, in __call__
    value = _eval_expr(self.expr, ctxt, **vars)
  File "/usr/lib/pymodules/python2.6/genshi/template/base.py", line
286, in _eval_expr
    retval = expr.evaluate(ctxt)
  File "/usr/lib/pymodules/python2.6/genshi/template/eval.py", line
180, in evaluate
    return eval(self.code, _globals, {'__data__': data})
  File "/usr/lib/python2.6/dist-packages/trac/templates/error.html",
line 66, in <Expression u'req.args'>
    <py:if test="req.args">
  File "/usr/lib/pymodules/python2.6/genshi/template/eval.py", line
311, in lookup_attr
    val = getattr(obj, key)
  File "/usr/lib/python2.6/dist-packages/trac/web/api.py", line 195,
in __getattr__
    value = self.callbacks[name](self)
  File "/usr/lib/python2.6/dist-packages/trac/web/api.py", line 490,
in _parse_args
    fs = cgi.FieldStorage(fp, environ=self.environ,
keep_blank_values=True)
  File "/usr/lib/python2.6/cgi.py", line 506, in __init__
    self.read_urlencoded()
  File "/usr/lib/python2.6/cgi.py", line 607, in read_urlencoded
    qs = self.fp.read(self.length)
IOError: request data read error

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