Captcha - Could not read font

Hi,

I have built my site on a local server and it all works well but when I put the files up to the live server the captcha security code stops working on the contact form so I ran the /WA_ValidationToolkit/WAVT_CaptchaSecurityImages.php form and I got the following errors

Warning: imagettfbbox() [function.imagettfbbox]: Could not read font in /home/aus47120/public_html/ausegroup_mo/WA_ValidationToolkit/WAVT_CaptchaSecurityImages.php on line 125

Warning: imagettfbbox() [function.imagettfbbox]: Could not read font in /home/aus47120/public_html/ausegroup_mo/WA_ValidationToolkit/WAVT_CaptchaSecurityImages.php on line 136

Warning: imagettfbbox() [function.imagettfbbox]: Could not read font in /home/aus47120/public_html/ausegroup_mo/WA_ValidationToolkit/WAVT_CaptchaSecurityImages.php on line 136

Warning: imagettfbbox() [function.imagettfbbox]: Could not read font in /home/aus47120/public_html/ausegroup_mo/WA_ValidationToolkit/WAVT_CaptchaSecurityImages.php on line 136

Warning: imagettfbbox() [function.imagettfbbox]: Could not read font in /home/aus47120/public_html/ausegroup_mo/WA_ValidationToolkit/WAVT_CaptchaSecurityImages.php on line 136

Warning: imagettfbbox() [function.imagettfbbox]: Could not read font in /home/aus47120/public_html/ausegroup_mo/WA_ValidationToolkit/WAVT_CaptchaSecurityImages.php on line 136

Warning: imagettftext() [function.imagettftext]: Could not read font in /home/aus47120/public_html/ausegroup_mo/WA_ValidationToolkit/WAVT_CaptchaSecurityImages.php on line 145

Warning: imagettftext() [function.imagettftext]: Could not read font in /home/aus47120/public_html/ausegroup_mo/WA_ValidationToolkit/WAVT_CaptchaSecurityImages.php on line 145

Warning: imagettftext() [function.imagettftext]: Could not read font in /home/aus47120/public_html/ausegroup_mo/WA_ValidationToolkit/WAVT_CaptchaSecurityImages.php on line 145

Warning: imagettftext() [function.imagettftext]: Could not read font in /home/aus47120/public_html/ausegroup_mo/WA_ValidationToolkit/WAVT_CaptchaSecurityImages.php on line 145

Warning: imagettftext() [function.imagettftext]: Could not read font in /home/aus47120/public_html/ausegroup_mo/WA_ValidationToolkit/WAVT_CaptchaSecurityImages.php on line 145

Warning: Cannot modify header information - headers already sent by (output started at /home/aus47120/public_html/ausegroup_mo/WA_ValidationToolkit/WAVT_CaptchaSecurityImages.php:125) in /home/aus47120/public_html/ausegroup_mo/WA_ValidationToolkit/WAVT_CaptchaSecurityImages.php on line 155
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Can you help please