On the "Error Control" tab you can set the Error Control mode, Error Log parameters and View Error Log file:
Error Control mode - select the needed mode: 'Debug' or 'Production':
debug mode - if there are any runtime errors, system will display Notices/Warnings, for example:
production mode - runtime errors will be hidden and not visible;
Log Errors - check this box if you want errors to be saved to the Error Log file;
Error Level - select which errors should be saved to the Error Log:
Log Lifetime - set the period of time Error Log should be stored in the Database:
View Error Log - clicking on this link you will be redirected to the "View Error Log" page.