React -TypeError: Cannot read property 'map' of undefined

i just use my code, and i get

TypeError: Cannot read property 'map' of undefined

    console.log(courses)
    return (
        <div>
            <div className="container">
                <div className="middle">
``
> What do i wrong?

                    <div className="card-details col-md-3 col-3 space-enter">
                        <div className="card text-black bg-white space-enter">
                            <img src=
                            {
                                courses.Course_Contents.map(content => {
                                return `http://localhost:3000/tmp/images/${content.filename}`
                            })
                            }