TypeError while running @@fix-persistent-utilities

Dear,

I've installed this on Plone 4.1.4 and trying to run @@fix-persistent-utilities but giving typeerror

TypeError: b2a_base64() argument 1 must be string or read-only buffer, not getset_descriptor

`: {u'': ( 0x08AEEEF0>,)}}}},
'repeat': 0x08FDB0C0>,
'request': utilities>,
'root': ,
'template': object at 0x074D9250>,
'traverse_subpath': [],
'user': ,
'view': 0x08E029D0>,
'views': }
Module zope.tales.pythonexpr, line 59, in __call__
- __traceback_info__: ( view.remove_utility_reg_url(adapter[0], 'adapters', item[0], item[1]))
Module , line 1, in
Module wildcard.fixpersistentutilities.views, line 199, in remove_utility_reg_url
Module wildcard.fixpersistentutilities.views, line 185, in utility_reg_data
Module base64, line 53, in b64encode
TypeError: b2a_base64() argument 1 must be string or read-only buffer, not > getset_descriptor`