install scipy with Active Python on mac os

as per the instructions i did pypm install scipy

command line in comes back with

The following packages will be installed into "~/Library/Python/3.2" (3.2): scipy-0.9.0 Hit: [pypm-开发者_如何学Cfree.activestate.com] scipy 0.9.0 Installing scipy-0.9.0 error: unpack requires a bytes object of length 4

any help appreciated.