The toolbar at no.wiki is missing during ordinary editing. See for example w:no:Bagn?action=edit&debug=true. For original complaints, see w:no:Wikipedia:Torget#Tekniske problemer med knapperekka igjen (den blir borte).
There is an error, but it is not clear that this is the root cause. As it involves jquery.wikiEditor.toolbar.js it is a likely cause. It is the only log entry I can find that seems likely to be connected with this.
URIError: malformed URI sequence jquery.cookie.js:17:20 decoded https://no.wikipedia.org/w/resources/lib/jquery/jquery.cookie.js:17:20 $.cookie https://no.wikipedia.org/w/resources/lib/jquery/jquery.cookie.js:65:17 buildSection https://no.wikipedia.org/w/extensions/WikiEditor/modules/jquery.wikiEditor.toolbar.js:676:16 build https://no.wikipedia.org/w/extensions/WikiEditor/modules/jquery.wikiEditor.toolbar.js:751:8 create https://no.wikipedia.org/w/extensions/WikiEditor/modules/jquery.wikiEditor.toolbar.js:233:5 addModule https://no.wikipedia.org/w/extensions/WikiEditor/modules/jquery.wikiEditor.js:339:9 $.fn.wikiEditor https://no.wikipedia.org/w/extensions/WikiEditor/modules/jquery.wikiEditor.js:647:5 <anonymous> https://no.wikipedia.org/w/extensions/WikiEditor/modules/ext.wikiEditor.toolbar.js:13:2 fire https://no.wikipedia.org/w/load.php:3148:10 fireWith https://no.wikipedia.org/w/load.php:3260:7 ready https://no.wikipedia.org/w/load.php:3472:3 completed https://no.wikipedia.org/w/load.php:3503:3