There are a lot of questions out there with this problem but i haven't found a solution for using SAX with this problem, so I found a simple workaround for me I wanted to share as a own answer.
In my case I imported this class and got the famous error you will know about if you have it to. :D
import org.xml.sax.SAXException;
I tried the solutions from the other questions with similar titels, but without a working solution.
Look at the answers to see what I did. If you have a better solution please send other answers to this question :)