Twitter Widget Pro plugin won’t activate

Just installed Twitter Widget Pro and tried to activate it and it gave me this error.

Plugin could not be activated because it triggered a fatal error.

Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or ‘}’ in /home/content/a/v/e/avenuebeads/html/blog/wp-content/plugins/twitter-widget-pro/wp-twitter-widget.php on line 41

This is the code that is on line 41

private $_settings;