I'm running: MediaWiki 1.30.0, Lua 5.1.5, Scribunto REL1_30 (4e3a20b), PHP: 7.0.28
I've reimported all dependent modules (Arguments, List, Navbox, Navbar), yet it still throws an error. No further details are included in the error box. I have debug running , nothing seems out of the ordinary. I'm out of my water here, Scribunto seems to be functioning in every other way. If you'd like you can check the current error here