i have installed gns3 alpha 6 in Debian 7.5 vagrant box but i cant not lunch it , receive the following error

i have installed all this packages
sudo apt-get install build-essential (libelf-dev uuid-dev libpcap-dev) (python3.3 python3-dev) (python3-pyqt4 python3-setuptools python3-ws4py) (python3-zmq python3-tornado python3-netifaces)

pip install -U pip

pip install -U setuptools

my desktop environment is XFCE

I also added
deb http://ftp.us.debian.org/debian testing main contrib non-free in source.list

Hi,

Qt seems to be missing. Try to reinstall it: apt-get install python3-pyqt4

_________________
Jeremy, GNS3 Programmer & Benevolent Dictator for Life.

i did it Sir , but still the same error

well i have fixed this error by installing SIP and qt and i reinstalled gui with python3.4 instead of 3.3
i still cant understand what that problem was .but its working now.