NLTK Not working in MAC OSX - scikit-learn

Question

from nltk.tokenize import word_tokenize
k=[]
example=['Mary had a little lamb' , 'Jack went up the hill' , 'Jill followed suit' ,'i woke up suddenly','it was a really bad dream...']
for i in example:
k.append(word_tokenize(i))
I was trying to compile this code but its not compiling and is giving errors which goes as follows :
File "<stdin>", line 1, in <module>
File "/Library/Python/2.7/site-packages/nltk/__init__.py", line 128, in <module>
from nltk.chunk import *
File "/Library/Python/2.7/site-packages/nltk/chunk/__init__.py", line 157, in <module>
from nltk.chunk.api import ChunkParserI
File "/Library/Python/2.7/site-packages/nltk/chunk/api.py", line 13, in <module>
from nltk.parse import ParserI
File "/Library/Python/2.7/site-packages/nltk/parse/__init__.py", line 79, in <module>
from nltk.parse.transitionparser import TransitionParser
File "/Library/Python/2.7/site-packages/nltk/parse/transitionparser.py", line 21, in <module>
from sklearn.datasets import load_svmlight_file
File "/Users/sudhir/Library/Python/2.7/lib/python/site-packages/sklearn/__init__.py", line 57, in <module>
from .base import clone
File "/Users/sudhir/Library/Python/2.7/lib/python/site-packages/sklearn/base.py", line 11, in <module>
from .utils.fixes import signature
File "/Users/sudhir/Library/Python/2.7/lib/python/site-packages/sklearn/utils/__init__.py", line 10, in <module>
from .murmurhash import murmurhash3_32
File "numpy.pxd", line 155, in init sklearn.utils.murmurhash (sklearn/utils/murmurhash.c:5029)
ValueError: numpy.dtype has the wrong size, try recompiling