Error importing demo

Hello guys,

I am working through the instructions, so far so good, but now I am stucked at the “Import Demo” process. I have activated all required plugins previously, so according to the instructions I can’t see why the error is occuring. I haven’t installed all “recommended” plugins though, because some I don’t need. https://ibb.co/HDP53FX

Here are the error messages, some parts are in german though, but “Ungültige Taxonomie” means “Invalid taxonomy” in English. https://ibb.co/3hJ3Jf3

Hope you can tell me what’s wrong here or how I can fix the issue.