warnng in header – theme magazine basic

i’m building a new site using the Magazine Basic theme. The site functions fine, but there’s a warning message in the header, I can’t seem to solve this error. Anyone have any idea?

The error message is:
Warning: getimagesize(https://www.uitgaandenhelder.nl/wp-content/themes/magazine-basic/uploads/Den Helder Actueel – Logo.gif) [function.getimagesize]: failed to open stream: HTTP request failed! HTTP/1.1 403 Forbidden in /home/uitgaan/domains/uitgaandenhelder.nl/public_html/wp-content/themes/magazine-basic/functions.php on line 108

——
The following is the code around line 108 in functions.php:
function uwc_head() {
if (get_option(‘uwc_logo_header’) == “yes”) {
(108): list($w, $h) = getimagesize(get_option(‘uwc_logo’));
$height = $h/2+20;
} else {
$height= 35;
}
——-
ofcourse the (108) is not in the code, but just to point out the line in question.
——
The website:
https://www.uitgaandenhelder.nl