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Another common issue could be the initialization of Summernote. If the user didn't set up the editor correctly in their JavaScript code, like not calling the .summernote() method on the right textarea, the editor won't appear. They might have missed some configuration options, like specifying the toolbar buttons or the height of the editor. Also, the order of script imports matters. If Summernote's JS is loaded before jQuery or Bootstrap, it won't work. The user might have the scripts in the wrong order. They should check that jQuery is first, then Bootstrap, then Summernote.