Hi Fateme
It seems that you are installing qutip with the default python distribution that comes with OS X (with old version of python, numpy etc). If you have installed macports and python+packages via macports as described in the installation section of the manual
then I guess you might not have run the command to make the macport python default:
sudo port select python python27
After doing this, try to run the installation again. You should run the "sudo python setup.py install" from the qutip-2.2.0 directory, not the qutip subdirectory within it.
You can also check which python you are actually using by running the command
which python
It should point to "/opt/local/bin/python" if everything is setup correctly (with macports).
Rob