파이썬 초보인데 오류좀 봐주세요

file -new file 해서 새로운 커멘드창 열엇는데 처음은 되는데
그다음부터 이런 오류가 뜨면서 되질 않습니다 도와주세요..

Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Python33\lib\tkinter\__init__.py", line 1475, in __call__
return self.func(*args)
File "C:\Python33\lib\idlelib\EditorWindow.py", line 362, in new_callback
self.flist.new(dirname)
File "C:\Python33\lib\idlelib\FileList.py", line 49, in new
return self.EditorWindow(self, filename)
File "C:\Python33\lib\idlelib\PyShell.py", line 126, in __init__
EditorWindow.__init__(self, *args)
File "C:\Python33\lib\idlelib\EditorWindow.py", line 297, in __init__
self.update_recent_files_list()
File "C:\Python33\lib\idlelib\EditorWindow.py", line 915, in update_recent_files_list
menu.delete(0, END) # clear, and rebuild:
File "C:\Python33\lib\tkinter\__init__.py", line 2778, in delete
if 'command' in self.entryconfig(i):
File "C:\Python33\lib\tkinter\__init__.py", line 2788, in entryconfigure
return self._configure(('entryconfigure', index), cnf, kw)
File "C:\Python33\lib\tkinter\__init__.py", line 1247, in _configure
self.tk.call(_flatten((self._w, cmd)))):
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xc0 in position 7: invalid start byte