[CentOS 7] Spacewalk - Cobbler XMLRPC Problem

Hello fellow redditors!

Me and my coworker are recently trying to fullfil the following quest:

https://www.reddit.com/r/linuxadmin/comments/2s924h/how_did_you_get_your_start/cnnw1ma

Basically i want to kickstart a virtual machine using koan and cobbler on my spacewalk machine. The problem is, cobbler doesn't want to give me any output via XMLRPC API with the following warnings in the log file:

Exception value: 'invalid token: N7LyGE2dhRLwaYJdiFCMQFi9Oc1ZBcxjxQ==' 

Is this a bug in Cobbler 2.0.11-42.el7, or did i make a mistake? Spacewalk and Cobbler are still on default settings.