Bugfix magento productpage

Hi,

I have a question regrading magento. I have just bought a new magento theme but i get a 500 error on my productpages. http://www.feestding.nl/paillettenjurk-kat.html don't know where to look.

I want to ask you if you can take a look at it. Can you give me a indication of the time used? 2 or 3 hours?

Hope to hear from you as soon as possible.

Best regards,

Stefan
Feestding.nl