I found the way how to install and use Arachni web.
1.Use synaptic package manager and complete removal arachni
You can use the project's build-scripts to automatically setup a self-contained environment which will include Arachni and all its dependencies.
2.Open console:
root@kali:~# ARACHNI_BUILD_ENV=development wget -O -
https://raw.github.com/Arachni/build...r/bootstrap.sh | bash
Wait for finish installation..
Arachni need almost 1GB disk space.
3. root@kali:~# cd arachni-build-dir
root@kali:~/arachni-build-dir# cd arachni
root@kali:~/arachni-build-dir/arachni# cd bin
root@kali:~/arachni-build-dir/arachni/bin# ./arachni_web
4. Open iceweasel and type
http://localhost:9292
In arachni directory you can find readme file where you can find mail and password for login....
Pictures:
http://postimg.org/gallery/7oskvieu/