Support plugin - Fatal error: incsub-support/inc/classes/class-shortcodes.php on line 69

I tried to install the support system plugin on my multisite with buddypress installed. Unfortunately I was unable to network activate the plugin because it triggered a fatal error.
Here is the message I received:

Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /public_html/wp-content/plugins/incsub-support/inc/classes/class-shortcodes.php on line 69