Can't make purchases

[Bewinxed]

Hello, Finally got this to work, I'm using python 2.6

When making a purchase i get this, Any pointers? Thanks!

Traceback (most recent call last):
  File "C:\BittrexBot\shell.py", line 152, in <module>
    cmd_manager.execute_command(core, tokens[0], params)
  File "C:\BittrexBot\ces\commands.py", line 1429, in execute_command
    self._commands[command].execute_command(handle, parameters)
  File "C:\BittrexBot\ces\commands.py", line 127, in execute_command
    self.execute(core, params)
  File "C:\BittrexBot\ces\commands.py", line 747, in execute
    if utils.show_operation_dialog():
  File "C:\BittrexBot\ces\utils.py", line 208, in show_operation_dialog
    readline.remove_history_item(readline.get_current_history_length() - 1)
AttributeError: 'module' object has no attribute 'remove_history_item'```