Experience Cloud サイトエラー: 「Blank Page or Lightning Component fails to load for Guest User or Experience Site User (ゲストユーザーまたは Experience Cloud サイトユーザーの空白ページまたは Lightning コンポーネントの読み込みに失敗します)」

<aura:component controller="CaseController" implements="force:appHostable,flexipage:availableForAllPageTypes,flexipage:availableForRecordHome,force:hasRecordId,forceCommunity:availableForAllPageTypes" access="global" >

</aura:component>

public without sharing class CaseController {
     
    @AuraEnabled
    public static List<Knowledge__kav> searchArticles(String dataCategory){
        
        List<Knowledge__kav> knowledgeArticleList = new List<Knowledge__kav>();
        try{
            
            knowledgeArticleList = [select title,Summary,UrlName from Knowledge__kav where PublishStatus = 'Online' limit 6];
            return knowledgeArticleList;
            
            
        }catch(Exception ex){
            
            return null;
        }
    }

}