“URL yang diminta tidak ditemukan di server. labu” Kode Jawaban

URL yang diminta tidak ditemukan di server. labu

The problem exists here...The place where you have to write form action="add" 
you have written it as action="submit"

<form action = "/add" methods="POST">
            <div class =  " form-group">
            <h3>Jeopardy Question</h3>
                <input
                    type = "text"
                    name = "Question"
                    placeholder= "Type the Jeopardy question here" 
                    />
            </div>
            <div class =  " form-group">
                <h3>Jeopardy Answer</h3>
                    <input
                        type = "text"
                        name = "Answer"
                        placeholder= "Type the Jeopardy Answer here" 
                        />

                </div>
  
        </form>