Thread:Project:Support desk/404 errors after upgrade from 1.15 to 1.20/reply (7)

If you are on shared hosting, it maybe somewhere is in a folder called logs/. Usually this folder is outside of the web-root (so that the file cannot be seen from the web).

If you are on shared hosting it is also possible that you do not have access to the PHP error log. In that case ask your hoster to tell what is inside. :-)