[TYPO3] problem with sr_freecap backend module [GD Font Maker]

[Gideon So]

Hi,

   When I click on the module icon, there is a blank page shown. And the
apache log shows the following:

PHP Fatal error:  main() [<a
href='function.require'>function.require</a>]: Failed opening required
'PATH_tslibclass.tslib_gifbuilder.php'
(include_path='.:/usr/share/pear') in
/var/www/html/typo3conf/ext/sr_freecap/mod1/class.tx_srfreecap_fontmaker.php
on line 32, referer: http://www.livingwater.org.hk/typo3/alt_menu.php

    Any ideas??

Gideon