How to enable syntax highlighting in ranger preview?

I have seen some screenshots where ranger uses syntax-highlighting in its preview window. So I was wondering how to enable this feature and found out that I need the scope.sh file in the directory /home/user/.config/ranger/scop.sh, which will be generated with the command $ ranger --copy-config=scope. After generating it however the preview window completely disappears, although I inserted set use_preview_script true in rc.config. Q: Does someone know how to enable syntax-highlighting (especially for C/C++) in the ranger preview window?