Board Thread:Support Requests - Getting Technical/@comment-24530269-20180427160521/@comment-27345308-20180506112628

Going by the order you posted the scripts/stylesheets/snippets:
 * 1) It does the same as InputUsername does but with a different class.
 * 2) It's an old default style that I believe doesn't do anything anymore.   class is nowhere to be found in Wikia's codebase, and it's obviously not in default Wikia.css anymore.
 * 3) That's NavFrame code that you don't need anymore because collapsing is a default thing in MediaWiki for... 8 years now?
 * 4) The last one is in two parts
 * 5) * The first part written by Rappy was explained by him, I believe
 * 6) * The last part changes the wordmark on certain pages. Used to, at least. Now it's a customization policy violation and the  class doesn't exist.

As for the first error, looks like TopicBlockLog was causing the issue.