Captcha errors… imagettfbbox??

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Hi Ok, i was getting an error that told me that I needed to install imagettfbbox, so this has been done, now I get the following error when trying to include captcha..

Fatal error: Call to a member function getController() on a non-object in /home/triton/public_html/doodles/updates/concrete5.6.2.1_updater/concrete/core/helpers/validation/captcha.php on line 10

any help greatly appreciated.

Thanks

in2orbit