[Forgiven]

Hello, i need help about the function "imagerotate"

I have installed on my web PHPBB3, a community of classic games, install a mod you have to do a description of a saved game, but to raise the game sends me the following error

Fatal error: Call to undefined function imagerotate() in /home/a4251718/public_html/recmod/RecordedGameReader.php on line 620

in a support forum told me that the problem is that hosting does not support "imagerotate" or not allowed, I have hope that can give me a solution, my website is not with any misuse, personal use only.

my website: http://www.clan-klrz.netii.net

thanks