comment function not working and photo not appear

my website is safuan.t35.com/gallery

the photo does not appear.
add comment function is not working,
how can i fix it?

when click on comment it appear,

Fatal error: Call to undefined function imagejpeg() in /home/freehost/t35.com/s/a/safuan/gallery/CodePicture.class.php on line 28

help me please


style="display:inline-block;width:468px;height:60px"
data-ad-client="ca-pub-8698264690166658"
data-ad-slot="4417389723">