Thread:Extension talk:Scribunto/Attempt to index local 'protectionLevels' (a nil value)./reply

This is because title.protectionLevels is a new Scribunto feature, and your version of Scribunto doesn't support it. And it is also because there was a bug in Module:Documentation where the module did not check for the possibility of protectionLevels not being present. I have now fixed this in the latest version of en:Module:Documentation. However, the latest version won't provide the protection icons if protectionLevels is not present, so you may want to use this old version instead, which uses the  parser function. Also, make sure that you have en:Template:Pp-template and en:Template:Pp-meta installed, which are used in either case.