Problem updating config quick adsense

I’m trying update config of quick adsense and my browser returns:

Warning: Cannot modify header information – headers already sent by (output started at /home/daquepen/public_html/wp-content/plugins/custom-ads-sidebar/custom-ads-sidebar.php:1)

unction wp_redirect($location, $status = 302) {
	global $is_IIS;

	$location = apply_filters('wp_redirect', $location, $status);
	$status = apply_filters('wp_redirect_status', $status, $location);

	if ( !$location ) // allows the wp_redirect filter to cancel a redirect
		return false;

	$location = wp_sanitize_redirect($location);

	if ( !$is_IIS && php_sapi_name() != 'cgi-fcgi' )
		status_header($status); // This causes problems on IIS and some FastCGI setups

	header("Location: $location", true, $status);
}
endif;

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876 is header(“Location: $location”, true, $status);

How can I fix this?
I’ve got no adsense ??

https://www.ads-software.com/extend/plugins/quick-adsense/