I am running my TW on node.js. I have installed codemirror plugin by adding the corresponding entry to my tiddlywiki.info file. Then I added CodeMirror-Mode-TiddlyWiki5 I downloaded the .json file and imported it in the wiki.
Now when I edit a tiddler, I get the following error:
Internal JavaScript Error
Well, this is embarrassing. It is recommended that you restart TiddlyWiki by refreshing your browser
TypeError: e.showHint is not a function. (In 'e.showHint(i)', 'e.showHint' is undefined)
I don’t know if its your problem but in the past this occurred for me with a codeMirror HTML related plugin. remove it and try and repeat. If that was the cause lets request a fix.