Default [Q] I can not get root for my Samsung Galaxy s4 mini

I followed the description for rooting my phone (http://forum.xda-developers.com/show....php?t=2364980)
So I installed the recovery-clockwork-6.0.3.7 - serranoltexx.tar.md5.
After that I rebooted the phone into recovery mode and choose,, apply update from external storage,, and afteer that I choose GT-9195_Rootkit_v2.zip. Then I see E: signature verification failed. What am I doing wrong?