Sounds like a missing File to me. Did you already verify the Game Files?
How do you do that?
If you have your game through Steam then I believe it is one of the options if you right click a game in your library.
Bethesda Support
help.bethesda.net
I would've posted it directly from Steam but Steam always wants to show it to me in German and it's such a Workaround to show it in english and I don't know how that Link works (If it would show up in german for you too or if it'll correct itself to your own Language)
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Go into your Steam library, right click on Planet Zoo, select properties, local files and verify integrity of game files, if there are missing files you should see a new download