numexpr 2.3.1 error with pandas 0.13.1
I just installed numexpr 2.3.1 with pandas 0.13.1 and got the following error:

  File "C:\Python27\lib\site-packages\pandas\core\ops.py", line 496, in wrapper
    arr = na_op(lvalues, rvalues)
  File "C:\Python27\lib\site-packages\pandas\core\ops.py", line 443, in na_op
    raise_on_error=True, *_eval_kwargs)
  File "C:\Python27\lib\site-packages\pandas\computation\expressions.py", line 176, in evaluate
    *_eval_kwargs)
  File "C:\Python27\lib\site-packages\pandas\computation\expressions.py", line 104, in _evaluate_numexpr
    *_eval_kwargs)
  File "C:\Python27\lib\site-packages\numexpr\necompiler.py", line 738, in evaluate
    NumExpr(ex, signature, *_context)
  File "C:\Python27\lib\site-packages\numexpr\necompiler.py", line 554, in NumExpr
    precompile(ex, signature, context)
  File "C:\Python27\lib\site-packages\numexpr\necompiler.py", line 498, in precompile
    ast = typeCompileAst(ast)
  File "C:\Python27\lib\site-packages\numexpr\necompiler.py", line 163, in typeCompileAst
    % (ast.value + '_' + retsig+basesig))
NotImplementedError: couldn't find matching opcode for 'mul_bbb'
