I've created a simple Visualfore page and a Apex class to process particular record of Knowledge__kavstandard object.

Visualforce Page:

<apex:page standardController="Knowledge__kav" extensions="KnowledgeController"  title="Knowledge__kav Object">

</apex:page>

Apex Class:

public with sharing class KnowledgeController {
    public String knowledgeID {get; set;}
    public KnowledgeController(ApexPages.StandardController stdController) {
        try {
            knowledgeID = ApexPages.currentPage().getParameters().get('id');
            System.debug('knowledgeID ===== '+knowledgeID);
           
            } catch(Exception e) {
            System.debug('ERROR :: ' + e.getMessage());
        }        
    }
}

For that, I'm passing simple URL parameter as ID (Knowledge__kav record ID) like /apex/KnowledgeAsPDF?id=ka02a0000004JeTAAU

But I'm getting the below error message ​on visualforce page.

Id value <Knowledge__kav record ID> is not valid for the Knowledge__kav standard controller

Page Preview:


Knowledge__kav SOQl Query:



Please help me to solve this issue.