Error for ttf

i have the same problem …and all had fix by using the functions.php of the child theme Code :

add_filter( 'upload_mimes', 'woodmart_upload_mimes', 100, 1 );
    function woodmart_upload_mimes( $mimes ) {
        if ( woodmart_get_opt( 'allow_upload_svg' ) ) {
            $mimes['svg'] = 'image/svg+xml';
            $mimes['svgz'] = 'image/svg+xml';
        }
        $mimes['woff'] = 'application/x-font-woff';
        $mimes['woff2'] = 'application/x-font-woff2';
        $mimes['ttf'] = 'application/x-font-ttf';
        $mimes['eot'] = 'application/vnd.ms-fontobject';
        return $mimes;
    }

but its give error for ttf i dont know why?