I am receiving this error when I upload a cover page photo on the template "shopin". This error populated and I've tried another example provided on the website but there's still no success. In the example, it advised to go into the "site.php" file and update line 34 and it should be cleared but it isn't working. I did update the "Force HTTPS" setting prior to the error. It is set to 'entire site'.
Please assist. Thank you.