Question [Q] Problems with root access / KNOX

Hello,

So I rooted, or I at least think I did, my I9505. I have installed cwm und the superSU-Update.zip.
Then when I am normally running my device and want to use apps with root access, KNOX denies it. When I start SuperSU, the following message appears: "There is no SuperSU-file installed and SuperSU can't install it. This is a problem. If you switched to Android 4.3, you have to manually root your device"
I have Android 4.3.

So how do I get my root access running?

Thanks in advance for your help,

Best regards, Simon