Dpaulus not working

[aclibrarian]

Dpaulus-Captcha not working, no image showing.
GD library with freetype installed & working.

Link to my gallery:
http://www.acfpl.org/inde...amp;id=146&Itemid=968

Could someone please tell me, in English (unfortunately do not speak German), how to solve this problem or how to upload a different Captcha that does not involve math?

thank you,
Aubrey

[aclibrarian]

Error Message:
Fatal error: Call to undefined function ImageTTFText() in /var/www/localhost/htdocs/aclibrary/components/com_easycaptcha/captchas/Dpaulus-Captcha/captcha.php on line 148

Line 148:
$ttfborders[] = ImageTTFText($tmp, $size+mt_rand(0, , mt_rand(-$angle, $angle), 20, $yspace-10, $fontcolor, $font, $seccode{$i});

When I remove this line I see the captch box with the various lines running through it but no captcha code, no font.  Anyone know how to fix this part of the php? 

Please assist.