Error when activating anspress on file anspress-question-answer.php line 569

Hi,

I have just tried to activate the plugin but I am getting an error.

Plugin could not be activated because it triggered a fatal error.
Parse error: syntax error, unexpected ‘[’ in /srv/www/vhosts/dp/wp-content/plugins/anspress-question-answer/anspress-question-answer.php on line 569

Using
Wordpress 4.7.4
PHP Version 5.3.17