HTML block problem

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Hello, i am new here and i have searched here on the forum but haven’t found my solution yet. I have a fresh install of concrete5 and followed the YouTube instructions for getting the images of my theme. Now i wanted to make blocks from parts of the theme, and now the <?=$get->ThisTheme();?> or <?=$v->getThisTheme();?> not working in html block of concrete5. So now i am at a loss since the images now don’t appear and when looking for the errors in my browser console now the < is shown now as %3 instead of the <.

So i would like some help with this one, i am working with the latest concrete version. Thnx in advance