JSON not working. Error BAD POINTER

[Javi]

test.json

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{
  "name": "JOHN"
}  

test1.pi

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class Test1 implements DOS_Program
{
    virtual Start()
    {
        _console = GetDOS().GetConsole();
        
        json = JSON_Open ("test.json");
		
        json_name= JSON_FindObjectItem(json, "name"); 
		name = JSON_ToString(json_name);
		
        
        _console.PrintLn("Hola mundo!!: " + name);
        _console.Input("", null, 1);
        End(0);
    }
}

Error JSON BAD POINTER