UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-3: ordinal not in range(128)

[adm1n007]

$ python main.py
Less than 12 hours. Loading previously saved Pickle...
Traceback (most recent call last):
File "main.py", line 372, in
w = MyUi()
File "main.py", line 94, in init
self.init_treeWidget(list1,series)
File "main.py", line 141, in init_treeWidget
var = series.loc[series["c_name"] == j]
File "/opt/anaconda2/lib/python2.7/site-packages/pandas/core/ops.py", line 1728, in wrapper
(is_extension_array_dtype(other) and not is_scalar(other))):
File "/opt/anaconda2/lib/python2.7/site-packages/pandas/core/dtypes/common.py", line 1749, in is_extension_array_dtype
registry.find(dtype) is not None)
File "/opt/anaconda2/lib/python2.7/site-packages/pandas/core/dtypes/dtypes.py", line 89, in find
return dtype_type.construct_from_string(dtype)
File "/opt/anaconda2/lib/python2.7/site-packages/pandas/core/dtypes/dtypes.py", line 699, in construct_from_string
raise TypeError(msg.format(string))
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-3: ordinal not in range(128)