Joomla! Documentation™

In normal operation a Joomla site should have logging disabled. If there are problems you can enable logging by setting the Log Almost Everything field to Yes. The Log Deprecated API is really for developers only. The Path to Log Folder field shows you where to look for logs if you have set up logging to help with debugging. The error logs you find there are only those trapped by Joomla. There may be other errors that will only appear in your server error logs.