load_workbook failed
*Created originally on Bitbucket by [bbzxw (Xiaowei Zhang)](https://bitbucket.org/%7B6fed189d-d7d8-41d2-adb8-98d6c1e530c8%7D/)*
File "C:\Python27\lib\site-packages\openpyxl\reader\excel.py", line 225, in load_workbook
ws_parser.parse()
File "C:\Python27\lib\site-packages\openpyxl\reader\worksheet.py", line 126, in parse
obj = prop[1].from_tree(element)
File "C:\Python27\lib\site-packages\openpyxl\descriptors\serialisable.py", line 76, in from_tree
obj = desc.expected_type.from_tree(el)
File "C:\Python27\lib\site-packages\openpyxl\descriptors\serialisable.py", line 76, in from_tree
obj = desc.expected_type.from_tree(el)
File "C:\Python27\lib\site-packages\openpyxl\descriptors\serialisable.py", line 89, in from_tree
return cls(**attrib)
File "C:\Python27\lib\site-packages\openpyxl\worksheet\filters.py", line 263, in __init__
self.filter = filter
File "C:\Python27\lib\site-packages\openpyxl\descriptors\sequence.py", line 27, in __set__
seq = [_convert(self.expected_type, value) for value in seq]
File "C:\Python27\lib\site-packages\openpyxl\descriptors\base.py", line 59, in _convert
raise TypeError('expected ' + str(expected_type))
TypeError: expected <type 'str'>
issue