QuizPort is intended for versions of Moodle up to 1.9.
For Moodle 2.x sites, please use the TaskChain module.
What version of Moodle are you using?
Also, what is the URL of the page that produced the error?
P.S. in Moodle, nearly all forms, not just the QuizPort forms, are based on PEAR Quickforms.