maybe your DOCUMENT_ROOT

for example: if you work in a subfolder from your domain, it's possible, that your DOCUMENT_ROOT is not the WB-Root-Folder
to your special case:
compare the error messages
path to the file /
path to WB is
/opt/lampp/htdocs/212/modules/jobs/update.php or
/opt/lampp/htdocs/212/your document-root is
/opt/lampp/htdocs/config.phpi'm missing the 212-folder
change it in your upgrade.php to
require('../../config.php');
Ruud was faster
