Trac detected an internal error: 
AttributeError: 'NoneType' object has no attribute 'get_changeset'

Python Traceback
Most recent call last: File "build/bdist.win32/egg/trac/web/main.py", line 522, in _dispatch_request 
Code fragment:
Line  
517     try: 
518         if not env and env_error: 
519             raise HTTPInternalError(env_error) 
520         try: 
521             dispatcher = RequestDispatcher(env) 
522             dispatcher.dispatch(req) 
523         except RequestDone: 
524             pass 
525         resp = req._response or [] 
526   
527     except HTTPException, e: 

Local variables:
Name Value 
dispatcher <trac.web.main.RequestDispatcher object at 0x0645B6D0> 
e AttributeError("'NoneType' object has no attribute 'get_changeset'",) 
env <trac.env.Environment object at 0x0439D050> 
env_error None 
req <Request "GET '/ticket/1'"> 
resp [] 

File "build/bdist.win32/egg/trac/web/main.py", line 264, in dispatch 
Code fragment:
Line  
259                             pprint(data, out) 
260                             req.send(out.getvalue(), 'text/plain') 
261                         else: 
262                             output = chrome.render_template(req, template, 
263                                                             data, 
264                                                             content_type) 
265                             # Give the session a chance to persist changes 
266                             req.session.save() 
267                             req.send(output, content_type or 'text/html') 
268                 else: 
269                     self._post_process_request(req) 

Local variables:
Name Value 
chosen_handler <trac.ticket.web_ui.TicketModule object at 0x06477CF0> 
chrome <trac.web.chrome.Chrome object at 0x0645BE50> 
content_type None 
data {'comment': None, 'change_preview': {'date': datetime.datetime(2012, 4, ... 
e TypeError("'NoneType' object does not support item assignment",) 
err (<type 'exceptions.AttributeError'>, AttributeError("'NoneType' object has ... 
handler <trac.ticket.web_ui.TicketModule object at 0x06477CF0> 
req <Request "GET '/ticket/1'"> 
resp ('ticket.html', {'comment': None, 'change_preview': {'date': ... 
self <trac.web.main.RequestDispatcher object at 0x0645B6D0> 
template 'ticket.html' 

File "build/bdist.win32/egg/trac/web/chrome.py", line 838, in render_template 
Code fragment:
Line  
833   
834         stream = template.generate(**data) 
835   
836         # Filter through ITemplateStreamFilter plugins 
837         if self.stream_filters: 
838             stream |= self._filter_stream(req, method, filename, stream, data) 
839   
840         if fragment: 
841             return stream 
842   
843         if method == 'text': 

Local variables:
Name Value 
content_type 'text/html' 
data {'comment': None, 'all': <built-in function all>, 'pprint': <function ... 
filename 'ticket.html' 
fragment False 
i 0 
method 'xhtml' 
req <Request "GET '/ticket/1'"> 
self <trac.web.chrome.Chrome object at 0x0645BE50> 
stream <genshi.core.Stream object at 0x0437BDD0> 
template <MarkupTemplate "ticket.html"> 
type_ 'notices' 

File "C:/trac/python/lib/site-packages/genshi-0.6-py2.6.egg/genshi/core.py", line 132, in __or__ 
Code fragment:
Line  
127          
128         :param function: the callable object that should be applied as a filter 
129         :return: the filtered stream 
130         :rtype: `Stream` 
131         """ 
132         return Stream(_ensure(function(self)), serializer=self.serializer) 
133   
134     def filter(self, *filters): 
135         """Apply filters to the stream. 
136          
137         This method returns a new stream with the given filters applied. The 

Local variables:
Name Value 
function <function inner at 0x06759030> 
self <genshi.core.Stream object at 0x0437BDD0> 

File "build/bdist.win32/egg/trac/web/chrome.py", line 994, in inner 
Code fragment:
Line  
989   
990     def _filter_stream(self, req, method, filename, stream, data): 
991         def inner(stream, ctxt=None): 
992             for filter in self.stream_filters: 
993                 stream = filter.filter_stream(req, method, filename, stream, 
994                                               data) 
995             return stream 
996         return inner 
997   
998     def _stream_location(self, stream): 
999         for kind, data, pos in stream: 

Local variables:
Name Value 
ctxt None 
data {'comment': None, 'all': <built-in function all>, 'pprint': <function ... 
filename 'ticket.html' 
filter <ticketmodifiedfiles.ticketmodifiedfiles.TicketModifiedFilesPlugin object ... 
method 'xhtml' 
req <Request "GET '/ticket/1'"> 
self <trac.web.chrome.Chrome object at 0x0645BE50> 
stream <genshi.core.Stream object at 0x0437BDD0> 

File "build/bdist.win32/egg/ticketmodifiedfiles/ticketmodifiedfiles.py", line 75, in filter_stream 
Code fragment:
Line  
70         return [('tmf', resource_filename(__name__, 'htdocs'))] 
71      
72     # ITemplateStreamFilter methods 
73     def filter_stream(self, req, method, filename, stream, data): 
74         if 'modifiedfiles' in data: 
75             numconflictingtickets = self.__process_ticket_request(req, True) 
76             #Display a warning message if there are conflicting tickets 
77             if numconflictingtickets > 0: 
78                 if numconflictingtickets == 1: 
79                     text = " There is one ticket in conflict!" 
80                 else: 

Local variables:
Name Value 
data {'comment': None, 'all': <built-in function all>, 'pprint': <function ... 
filename 'ticket.html' 
method 'xhtml' 
req <Request "GET '/ticket/1'"> 
self <ticketmodifiedfiles.ticketmodifiedfiles.TicketModifiedFilesPlugin object ... 
stream <genshi.core.Stream object at 0x0437BDD0> 

File "build/bdist.win32/egg/ticketmodifiedfiles/ticketmodifiedfiles.py", line 135, in __process_ticket_request 
Code fragment:
Line  
130                  
131             if validrevision: 
132                 if not justnumconflictingtickets: 
133                     date = "(" + format_time(time, str('%d/%m/%Y - %H:%M')) + ")" 
134                     revisions.append((rev, author, date)) 
135                 for node_change in repos.get_changeset(rev).get_changes(): 
136                     files.append(node_change[0]) 
137                      
138          
139         #Remove duplicated values 
140         files = self.__remove_duplicated_elements_and_sort(files) 

Local variables:
Name Value 
author u'kardosj' 
cursor <trac.db.util.IterableCursor object at 0x05AD8390> 
db <trac.db.pool.PooledConnection object at 0x05958238> 
files [] 
id 1 
ignored_statuses ['closed'] 
justnumconflictingtickets True 
message u'Update queries to support new concat technique Refs #1' 
repos None 
req <Request "GET '/ticket/1'"> 
rev u'0000002545' 
revisions [] 
self <ticketmodifiedfiles.ticketmodifiedfiles.TicketModifiedFilesPlugin object ... 
tempstr [u'Update queries to support new concat technique Refs ', u''] 
thisticket <trac.ticket.model.Ticket object at 0x05AD8FF0> 
ticketsperfile {} 
time 1334069314001510L 
validrevision True 

File "build/bdist.win32/egg/trac/web/main.py", line 522, in _dispatch_request
  dispatcher.dispatch(req)
File "build/bdist.win32/egg/trac/web/main.py", line 264, in dispatch
  content_type)
File "build/bdist.win32/egg/trac/web/chrome.py", line 838, in render_template
  stream |= self._filter_stream(req, method, filename, stream, data)
File "C:/trac/python/lib/site-packages/genshi-0.6-py2.6.egg/genshi/core.py", line 132, in __or__
  return Stream(_ensure(function(self)), serializer=self.serializer)
File "build/bdist.win32/egg/trac/web/chrome.py", line 994, in inner
  data)
File "build/bdist.win32/egg/ticketmodifiedfiles/ticketmodifiedfiles.py", line 75, in filter_stream
  numconflictingtickets = self.__process_ticket_request(req, True)
File "build/bdist.win32/egg/ticketmodifiedfiles/ticketmodifiedfiles.py", line 135, in __process_ticket_request
  for node_change in repos.get_changeset(rev).get_changes():


System Information:
User Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.648; .NET CLR 3.5.21022; MS-RTC LM 8; .NET4.0C; .NET4.0E; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; .NET Client 3.5.30729.01)

Trac 0.12.3 
Babel 0.9.5 
Genshi 0.6 
mod_wsgi 3.3 (WSGIProcessGroup WSGIApplicationGroup %{GLOBAL}) 
pysqlite 2.6.0 
Python 2.6.2 (r262:71605, Apr 14 2009, 22:40:02) [MSC v.1500 32 bit (Intel)] 
setuptools 0.6c11 
SQLite 3.6.2 
Subversion 1.6.15 (r1038135) 
jQuery 1.4.4 

Enabled Plugins:
ticketmodifiedfiles  1.00 c:\trac\python\lib\site-packages\ticketmodifiedfiles-1.00-py2.6.egg 
tracaccountmanager  0.3.2 c:\trac\python\lib\site-packages\tracaccountmanager-0.3.2-py2.6.egg 
tracdiscussion  0.8 c:\trac\python\lib\site-packages\tracdiscussion-0.8-py2.6.egg