Can you provide more information? What does the error say when you click on the link that says "1 problem"? (and can you translate it to English)
That means you haven't setup Google Analytics dynamic remarketing correctly. To do this, you can see a free chapter in my book on Google Shopping in Shopify.
If you're following my tutorial, you are completely in the wrong section. Follow more closely. You will edit the theme and the checkout settings, not the Google Analytics setup (though if you're curious about how to get analytics setup beautifully with complete clean data, I have tutorial for that too ;-))
What do you mean you did not get it to work? What do have setup? My response above answers your other questions that you are looking at the wrong place to setup conversion tracking. (It's setup in Settings > Checkout then order page scripts section.) Hence why you need to follow a tutorial.