So ive just installed this forum on ubuntu i get this error after installing Parse error: syntax error, unexpected '[' in /var/www/forum/sys/vendor/illuminate/database/Illuminate/Database/Query/Builder.php on line 979

But i can still access the admin panel

You are using an old version of PHP.
please upgrade your PHP version to 5.4+ to activate all features. (latest is 5.6)

still getting the error
I've installed 5.6 and still get the error i've also reinstalled the forum!!!
Server version: Apache/2.2.22 (Ubuntu)
Server built: Jul 22 2014 14:37:02

PHP 5.6.1 (cli) (built: Oct 13 2014 19:43:45)
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