Error on moodle after upgrade

I updated my moodle from 2.4 to 3.0, and now I got this :
Parse error: syntax error, unexpected '[' in /var/www/moodle/lib/outputrenderers.php on line 110

How can I fix it ?
Jose BredariolPMPAsked:
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perhaps you should uninstall both versions, remove all references to 'moodle' from your system and then download and install the newest version.

of course that doesn't help from porting any existing projects and source file to the newer version but should help from errors like the one you reported.

nociSoftware EngineerCommented:
be carefull to keep original config files for reference, and keep file content that my be stored below the moodle root.

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Jose BredariolPMPAuthor Commented:
thanks all
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