JError::raiseWarning(500, 'Unable to save the data.');
JError::raiseError(500, 'Internal server error.');This code will log a fatal error with error code 500 and the message "Internal server error." The error message will be displayed to the user, and the execution of the script will halt. The JError raiseError method is included in the Joomla core library, which is a package library used for developing Joomla extensions.