Enable the products one by one to find out which is causing the error (test each time you enable a product). Once you have found out which is problem product, disable the plugins associated with that product and then, like you did with the products, enable them one by one until to find out which is giving you the error.
(Once you know which is the problem product try searching/asking in the thread/board from which you downloaded the modification from, that will be your best chance of receiving a response)
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