The class ultimate\data\content\ContentEditor is declared but never used. You should remove the use statement.
use ultimate\acp\form\UltimateContentAddForm;
use ultimate\data\category\Category;
use ultimate\data\content\CategorizedContent;
use ultimate\data\content\Content;
use ultimate\data\content\ContentAction;
use ultimate\data\content\ContentEditor;
use ultimate\system\cache\builder\ContentCacheBuilder;
use ultimate\system\cache\builder\ContentTagCloudCacheBuilder;
use wcf\data\tag\Tag;
use wcf\form\AbstractForm;
use wcf\form\MessageForm;
There are a total of 67 of such errors. Fix them all.
in src/lib/acp/form/UltimateContentEditForm.class.php, line 34
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