"http error 500" on product page after changing to custom template

Hi

I have created a new custom product template for my product. If I go into the product page and change it to use my custom template from the drop-down, the product page gives me a “http error 500” message and doesn’t show the page at all. If I change the template back to “default” the product page works normally again. Would anyone have an idea what could be the problem?

Thanks.

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