stop = pickle.load(open('movieclassifier/pkl_objects/stopwords.pkl', 'rb')) is not working.

[mickymartin]

i am executing your source.
however, when i execute api.py i can get following errors.

"Traceback (most recent call last):
File "E:/work/phython/ml-integration/ml-int/textsummarizersvc/api.py", line 15, in
import movieclassifier as mc
File "E:\work\phython\ml-integration\ml-int\textsummarizersvc\movieclassifier.py", line 5, in
from vectorizer import vect
File "E:\work\phython\ml-integration\ml-int\textsummarizersvc\vectorizer.py", line 7, in
stop = pickle.load(open('movieclassifier/pkl_objects/stopwords.pkl', 'rb'))
File "C:\Python27\lib\pickle.py", line 1384, in load
return Unpickler(file).load()
File "C:\Python27\lib\pickle.py", line 864, in load
dispatchkey
File "C:\Python27\lib\pickle.py", line 892, in load_proto
raise ValueError, "unsupported pickle protocol: %d" % proto
ValueError: unsupported pickle protocol: 4"

i want you to help me.