Problema con Capcha en HostGator

[dezagus]

La linea 64 dice esto:

#place each character in a random position
$font = 'arial.ttf';
for($i=0;$i<5;$i++){
$color = rand(0,32);
if(file_exists($font)){
$x=4+$i*23+rand(0,6);
$y=rand(18,28);
imagettftext ($captcha, 15, rand(-25,25), $x, $y, imagecolorallocate($captcha, $color, $color, $color), $font, $string[$i]);
}else{
$x=5+$i*24+rand(0,6);
$y=rand(1,18);
imagestring($captcha, 5, $x, $y, $string[$i], imagecolorallocate($captcha, $color, $color, $color));
}
}