The style.css stylesheet doesn’t contain a valid theme header. what should I do, please?

Try something like this instead:

/**
 * Theme Name: Mamba
 * Theme URI: https://bootstrapmade.com/mamba-one-page-bootstrap-template-free/
 * Author: BootstrapMade
 * Author URI: https://bootstrapmade.com/
 * Version: 4.0.1
 * License URI: https://bootstrapmade.com/license/
 */

Or something like:

/*
Theme Name: Mamba
Theme URI: https://bootstrapmade.com/mamba-one-page-bootstrap-template-free/
Author: BootstrapMade
Author URI: https://bootstrapmade.com/
Version: 4.0.1
License URI: https://bootstrapmade.com/license/
*/

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