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exceptions must be old-style classes or derived from BaseException, not str
Please include this information in your bug reports!:
Python Python 2.7.18: /usr/bin/python2
Linux erode.bofh.it 4.19.0-6-amd64 #1 SMP Debian 4.19.67-2 (2019-08-28) x86_64
MoinMoin Release 1.2.4 [Revision 1.187]
Thu Jan 21 13:05:39 2021

A problem occurred in a Python script. Here is the sequence of function calls leading up to the error, in the order they occurred.

 /usr/local/share/moin/MoinMoin/request.py in run(self=<MoinMoin.request.RequestCGI instance>)
  403 
  404                 if config.allow_extended_names:
  405                     Page(query).send_page(self, count_hit=1)
  406                 else:
  407                     from MoinMoin.parser.wiki import Parser
Page = <class MoinMoin.Page.Page>, query = 'CategoryHomepage', ).send_page undefined, self = <MoinMoin.request.RequestCGI instance>, count_hit undefined

 /usr/local/share/moin/MoinMoin/Page.py in send_page(self=<MoinMoin.Page.Page instance>, request=<MoinMoin.request.RequestCGI instance>, msg='', **keywords={'count_hit': 1})
  622         else:
  623             # parse the text and send the page content
  624             self.send_page_content(request, Parser, body)
  625 
  626             # check for pending footnotes
self = <MoinMoin.Page.Page instance>, self.send_page_content = <bound method Page.send_page_content of <MoinMoin.Page.Page instance>>, request = <MoinMoin.request.RequestCGI instance>, Parser = <class MoinMoin.parser.wiki.Parser>, body = "A category for WikiHomePage''''''s.\n\nNote that s... Hi! -- J\xfcrgenHermann\n}}}\n\n----\nCategoryCategory\n"

 /usr/local/share/moin/MoinMoin/Page.py in send_page_content(self=<MoinMoin.Page.Page instance>, request=<MoinMoin.request.RequestCGI instance>, Parser=<class MoinMoin.parser.wiki.Parser>, body="A category for WikiHomePage''''''s.\n\nNote that s... Hi! -- J\xfcrgenHermann\n}}}\n\n----\nCategoryCategory\n", needsupdate=0)
  721 
  722         try:
  723             exec code
  724         except 'CacheNeedsUpdate': # if something goes wrong, try without caching
  725            self.send_page_content(request, Parser, body, needsupdate=1)
code = <code object <module> at 0x7f9021fd4230, file "CategoryHomepage", line 2>

 /home/gcn/wiki/CategoryHomepage in ()

: exceptions must be old-style classes or derived from BaseException, not str