numpy import error

(aaa)$ python
Python 2.7.5 (default, Apr 21 2014, 21:36:22)
[GCC 4.2.1 Compatible Apple LLVM 5.1 (clang-503.0.40)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/xxx/ng/home/common/tmp/aaa/lib/python2.7/site-packages/numpy/__init__.py", line 153, in <module>
    from . import add_newdocs
  File "/Users/xxx/ng/home/common/tmp/aaa/lib/python2.7/site-packages/numpy/add_newdocs.py", line 13, in <module>
    from numpy.lib import add_newdoc
  File "/Users/xxx/ng/home/common/tmp/aaa/lib/python2.7/site-packages/numpy/lib/__init__.py", line 8, in <module>
    from .type_check import *
  File "/Users/xxx/ng/home/common/tmp/aaa/lib/python2.7/site-packages/numpy/lib/type_check.py", line 11, in <module>
    import numpy.core.numeric as _nx
  File "/Users/xxx/ng/home/common/tmp/aaa/lib/python2.7/site-packages/numpy/core/__init__.py", line 6, in <module>
    from . import multiarray
ImportError: dlopen(/Users/xxx/ng/home/common/tmp/aaa/lib/python2.7/site-packages/numpy/core/multiarray.so, 2): Symbol not found: _aheapsort_bool
  Referenced from: /Users/xxx/ng/home/common/tmp/aaa/lib/python2.7/site-packages/numpy/core/multiarray.so
  Expected in: dynamic lookup

>>>