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TypeError: first argument must be string or compiled pattern

Python 2.3.4 /usr/bin/python2

A problem occurred while running a Python script. Here is the sequence of function calls leading up to the error, with the most recent (innermost) call first. The exception attributes are:
      __doc__ = 'Inappropriate argument type.'
      __getitem__ = <bound method TypeError.__getitem__ of <exceptions.TypeError instance at 0x2a95e46128>>
      __init__ = <bound method TypeError.__init__ of <exceptions.TypeError instance at 0x2a95e46128>>
      __module__ = 'exceptions'
      __str__ = <bound method TypeError.__str__ of <exceptions.TypeError instance at 0x2a95e46128>>
      args = ('first argument must be string or compiled pattern',)

/usr/lib64/python2.3/sre.py in _compile(*key=(None, 2))

  224         return pattern
  225     if not sre_compile.isstring(pattern):

226         raise TypeError, "first argument must be string or compiled pattern"

       global TypeError = undefined
  227     try:
  228         p = sre_compile.compile(pattern, flags)

/usr/lib64/python2.3/sre.py in compile(pattern=None, flags=2)

  177 def compile(pattern, flags=0):
  178     "Compile a regular expression pattern, returning a pattern object."

179     return _compile(pattern, flags)

       global _compile = <function _compile>, pattern = None, flags = 2
  180 
  181 def purge():

/pixies0/moloko1/sra/movabletype/moin-1.0/MoinMoin/wikimacro.py in _macro_PageList(self=<MoinMoin.wikimacro.Macro instance>, args=None)

  277             needle_re = re.compile(args, re.IGNORECASE)
  278         except re.error, e:

279             return "<b>%s: %s</b>" % (

       global _ = <function getText>, args = None, e = undefined
  280                 _("ERROR in regex '%s'") % (args,), e)
  281 

/pixies0/moloko1/sra/movabletype/moin-1.0/MoinMoin/wikimacro.py in execute(self=<MoinMoin.wikimacro.Macro instance>, macro_name='PageList', args=None)

   75         builtins = vars(self.__class__)
   76         if builtins.has_key('_macro_' + macro_name):

77             return apply(builtins['_macro_' + macro_name], (self, args))

       global apply = undefined, builtins = {'_Macro__get_Date': <function __get_Date>, '__doc__': ' Macro handler ', '__init__': <function __init__>, '__module__': 'MoinMoin.wikimacro', '_m_search': <function _m_search>, '_macro_Anchor': <function _macro_Anchor>, '_macro_Date': <function _macro_Date>, '_macro_DateTime': <function _macro_DateTime>, '_macro_GoTo': <function _macro_GoTo>, '_macro_Icon': <function _macro_Icon>, ...}, macro_name = 'PageList', self = <MoinMoin.wikimacro.Macro instance>, args = None
   78 
   79         # load extension macro

/pixies0/moloko1/sra/movabletype/moin-1.0/MoinMoin/parser/wiki.py in _macro_repl(self=<MoinMoin.parser.wiki.Parser instance>, word='[[PageList]]')

  636 
  637         # call the macro

638         return self.macro.execute(macro_name, args)

       self = <MoinMoin.parser.wiki.Parser instance>, global macro = undefined, global execute = undefined, macro_name = 'PageList', args = None
  639 
  640 

/pixies0/moloko1/sra/movabletype/moin-1.0/MoinMoin/parser/wiki.py in replace(self=<MoinMoin.parser.wiki.Parser instance>, match=<_sre.SRE_Match object>)

  746                     return self.highlight_text(hit)
  747                 else:

748                     return apply(getattr(self, '_' + type + '_repl'), (hit,))

       global apply = undefined, global getattr = undefined, self = <MoinMoin.parser.wiki.Parser instance>, type = 'macro', hit = '[[PageList]]'
  749         else:
  750             import pprint

/usr/lib64/python2.3/sre.py in subn(pattern=<_sre.SRE_Pattern object>, repl=<bound method Parser.replace of <MoinMoin.parser.wiki.Parser instance at 0x2a95e33e60>>, string='Additionally, there are the [[PageList]], [[Ful... generate indices for cohesive parts of a wiki. ', count=0)

  149     string by the replacement repl.  number is the number of
  150     substitutions that were made."""

151     return _compile(pattern, 0).subn(repl, string, count)

       global _compile = <function _compile>, pattern = <_sre.SRE_Pattern object>, global subn = <function subn>, repl = <bound method Parser.replace of <MoinMoin.parser.wiki.Parser instance at 0x2a95e33e60>>, string = 'Additionally, there are the [[PageList]], [[Ful... generate indices for cohesive parts of a wiki. ', count = 0
  152 
  153 def split(pattern, string, maxsplit=0):

/pixies0/moloko1/sra/movabletype/moin-1.0/MoinMoin/parser/wiki.py in format(self=<MoinMoin.parser.wiki.Parser instance>, formatter=<MoinMoin.formatter.text_html.Formatter instance>, form=FieldStorage(None, None, []))

  863                 sys.stdout.write(self.highlight_scan(scan_re, line + " "))
  864             else:

865                 line, count = re.subn(scan_re, self.replace, line + " ")

       line = 'Additionally, there are the [[PageList]], [[Ful...y generate indices for cohesive parts of a wiki.', count = 2, global re = <module 're' from '/usr/lib64/python2.3/re.pyc'>, global subn = undefined, scan_re = <_sre.SRE_Pattern object>, self = <MoinMoin.parser.wiki.Parser instance>, global replace = undefined
  866                 ##if not count: self._check_p()
  867                 self._check_p()

/pixies0/moloko1/sra/movabletype/moin-1.0/MoinMoin/Page.py in send_page(self=<MoinMoin.Page.Page instance>, request=<MoinMoin.request.Request instance>, msg='', **keywords={'count_hit': 1})

  378         else:
  379             # parse the text and send the page content

380             Parser(body, request).format(self.formatter, form)

       Parser = <class MoinMoin.parser.wiki.Parser>, body = 'SiteNavigation is the central place to explore ...generate indices for cohesive parts of a wiki.\n', request = <MoinMoin.request.Request instance>, global format = undefined, self = <MoinMoin.Page.Page instance>, global formatter = undefined, form = FieldStorage(None, None, [])
  381 
  382             # check for pending footnotes

/bowie0/moloko1/sra/movabletype/moin-1.0/MoinMoin/cgimain.py in run(properties={})

  233         else:
  234             try:

235                 cgitb.handler()

       cgitb = <module 'MoinMoin.support.cgitb' from '/pixies0/.../movabletype/moin-1.0/MoinMoin/support/cgitb.py'>, handler = undefined
  236             except:
  237                 apply(cgi.print_exception, saved_exc)