Application Error when Confirming Inventory

[jayd]

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/move.py”, line 688, in do
cost_price = move._do()
File “/trytond/modules/product_cost_fifo/move.py”, line 117, in _do
cost_price = self._compute_product_cost_price(‘in’)
File “/trytond/modules/stock/move.py”, 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.

[2cadz (Christophe)]

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?

[jayd]

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