ipython crash dump readline missing

Crash_report_ipython.txt

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IPython post-mortem report

{'commit_hash': 'bae849b',
 'commit_source': 'repository',
 'ipython_path': 'c:\\python\\external\\ipython\\IPython',
 'ipython_version': '0.12.dev',
 'os_name': 'nt',
 'platform': 'Windows-7-6.1.7601-SP1',
 'sys_executable': 'c:\\python26\\python.exe',
 'sys_platform': 'win32',
 'sys_version': '2.6.6 (r266:84297, Aug 24 2010, 18:46:32) [MSC v.1500 32 bit (Intel)]'}

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Crash traceback:

---------------------------------------------------------------------------
AttributeError                         Python 2.6.6: c:\python26\python.exe
                                                   Thu Oct 20 21:12:43 2011
A problem occured executing Python code.  Here is the sequence of function
calls leading up to the error, with the most recent (innermost) call last.
C:\python\ipydevel\<string> in <module>()

c:\python\external\ipython\IPython\frontend\terminal\ipapp.pyc in launch_new_instance()
    365             self.shell.mainloop()
    366         else:
    367             self.log.debug("IPython not interactive...")
    368 
    369 
    370 def load_default_config(ipython_dir=None):
    371     """Load the default config file from the default ipython_dir.
    372 
    373     This is useful for embedded shells.
    374     """
    375     if ipython_dir is None:
    376         ipython_dir = get_ipython_dir()
    377     profile_dir = os.path.join(ipython_dir, 'profile_default')
    378     cl = PyFileConfigLoader(default_config_file_name, profile_dir)
    379     try:
    380         config = cl.load_config()
    381     except ConfigFileNotFound:
    382         # no config found
    383         config = Config()
    384     return config
    385 
    386 
    387 def launch_new_instance():
    388     """Create and run a full blown IPython instance"""
    389     app = TerminalIPythonApp.instance()
    390     app.initialize()
--> 391     app.start()
    392 
    393 
    394 if __name__ == '__main__':
    395     launch_new_instance()

c:\python\external\ipython\IPython\frontend\terminal\ipapp.pyc in start(self=<IPython.frontend.terminal.ipapp.TerminalIPythonApp object>)
    350                               "toolkit=%s, pylab=%s" % (gui, self.pylab) )
    351                 if self.pylab:
    352                     activate(gui, import_all=self.pylab_import_all)
    353                 else:
    354                     activate(gui)
    355             except:
    356                 self.log.warn("Error in enabling GUI event loop integration:")
    357                 self.shell.showtraceback()
    358 
    359     def start(self):
    360         if self.subapp is not None:
    361             return self.subapp.start()
    362         # perform any prexec steps:
    363         if self.interact:
    364             self.log.debug("Starting IPython's mainloop...")
--> 365             self.shell.mainloop()
    366         else:
    367             self.log.debug("IPython not interactive...")
    368 
    369 
    370 def load_default_config(ipython_dir=None):
    371     """Load the default config file from the default ipython_dir.
    372 
    373     This is useful for embedded shells.
    374     """
    375     if ipython_dir is None:
    376         ipython_dir = get_ipython_dir()
    377     profile_dir = os.path.join(ipython_dir, 'profile_default')
    378     cl = PyFileConfigLoader(default_config_file_name, profile_dir)
    379     try:
    380         config = cl.load_config()

c:\python\external\ipython\IPython\frontend\terminal\interactiveshell.pyc in mainloop(self=<IPython.frontend.terminal.interactiveshell.TerminalInteractiveShell object>, display_banner=None)
    207     #-------------------------------------------------------------------------
    208     # Mainloop and code execution logic
    209     #-------------------------------------------------------------------------
    210 
    211     def mainloop(self, display_banner=None):
    212         """Start the mainloop.
    213 
    214         If an optional banner argument is given, it will override the
    215         internally created default banner.
    216         """
    217 
    218         with nested(self.builtin_trap, self.display_trap):
    219 
    220             while 1:
    221                 try:
--> 222                     self.interact(display_banner=display_banner)
        global a = undefined
    223                     #self.interact_with_readline()
    224                     # XXX for testing of a readline-decoupled repl loop, call
    225                     # interact_with_readline above
    226                     break
    227                 except KeyboardInterrupt:
    228                     # this should not be necessary, but KeyboardInterrupt
    229                     # handling seems rather unpredictable...
    230                     self.write("\nKeyboardInterrupt in interact()\n")
    231 
    232     def _replace_rlhist_multiline(self, source_raw, hlen_before_cell):
    233         """Store multiple lines as a single entry in history"""
    234         if self.multiline_history and self.has_readline:
    235             hlen = self.readline.get_current_history_length()
    236             for i in range(hlen - hlen_before_cell):
    237                 self.readline.remove_history_item(hlen - i - 1)

c:\python\external\ipython\IPython\frontend\terminal\interactiveshell.pyc in interact(self=<IPython.frontend.terminal.interactiveshell.TerminalInteractiveShell object>, display_banner=False)
    243         """Closely emulate the interactive Python console."""
    244 
    245         # batch run -> do not interact
    246         if self.exit_now:
    247             return
    248 
    249         if display_banner is None:
    250             display_banner = self.display_banner
    251 
    252         if isinstance(display_banner, basestring):
    253             self.show_banner(display_banner)
    254         elif display_banner:
    255             self.show_banner()
    256 
    257         more = False
--> 258         hlen_before_cell = self.readline.get_current_history_length()
        global cpaste = undefined
        global manually = undefined
        global paste = undefined
        global code = undefined
        global into = undefined
        global terminal = undefined
        global until = undefined
        global you = undefined
        global mark = undefined
        global its = undefined
        global end. = undefined
    259 
    260         # Mark activity in the builtins
    261         __builtin__.__dict__['__IPYTHON__active'] += 1
    262 
    263         if self.has_readline:
    264             self.readline_startup_hook(self.pre_readline)
    265         # exit_now is set by a call to %Exit or %Quit, through the
    266         # ask_exit callback.
    267 
    268         while not self.exit_now:
    269             self.hooks.pre_prompt_hook()
    270             if more:
    271                 try:
    272                     prompt = self.hooks.generate_prompt(True)
    273                 except:

AttributeError: 'NoneType' object has no attribute 'get_current_history_length'

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History of session input:
*** Last line of input (may not be in above history):