the definition in the functions.php is not correct. Correct is:
// Enqueue parent action
if ( ! function_exists( 'evolve_parent_css' ) ) {
function evolve_parent_css() {
wp_enqueue_style( 'evolve-parent', trailingslashit( get_template_directory_uri() ) . 'style.css', array( 'evolve-bootstrap' ) );
}
}
add_action( 'wp_enqueue_scripts', 'evolve_parent_css', 10 );