This is an old revision of the document!
https://forum.dokuwiki.org/post/55523
You should update “Gallery Plugin” before the DokuWiki update!
If you didnt, you need to disable the plugin:
To get into the adminmenu, disable javascript
or
edit “plugins.local.php” and insert “$plugins['gallery'] = 0;”
or
remove the folder “lib/plugins/gallery” and reinstall the plugin later