Seems you break product template schema and now it throw error on page.
To fix it try to revert the changes you did in template. Or if you want, you can drop me an email and we'll discuss further.
Want to modify or custom changes on store hire me. My Email: firstname.lastname@example.org Skype: navrocks1 If helpful then please Like and Accept Solution. If you are happy and want to donate small Click here (Its my paypal)