Application Error when Confirming Inventory

Version 6.0 - When I click on confirm in a draft inventory I get the following application error (last few lines):
File “/trytond/modules/stock/”, line 688, in do
cost_price = move._do()
File “/trytond/modules/product_cost_fifo/”, line 117, in _do
cost_price = self._compute_product_cost_price(‘in’)
File “/trytond/modules/stock/”, line 596, in _compute_product_cost_price
(cost_price * product_qty) + (unit_price * qty)
TypeError: unsupported operand type(s) for *: ‘NoneType’ and ‘decimal.Decimal’

Fault: unsupported operand type(s) for *: ‘NoneType’ and ‘decimal.Decimal’

Any ideas from this on what I’m missing? Thank you.

For this type of error, one of the following four elements is not entered for an inventory line or product: cost_price, product_qty, unit_price, qty.
In this case, are you sure you have entered the ‘Cost Price’ and the ‘List Price’ on all the products in the inventory?

Thank you very much, I exported a report and found one product without a cost price, that solved it.

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