protected String handleError(final String message, final Throwable cause) {
        notifier().error(formatMessage(message), cause);
        return formatMessage(message);
    }
protected String handleError ( final String message , final Throwable cause ) { notifier ( ) . error ( formatMessage ( message ) , cause ) ; return formatMessage ( message ) ; }
Handle invalid helper data with exception details in the log message.

@param message message to log and return
@param cause   which occurred during application of the helper
@return a message which will be used as content