I am not getting any solution regarding below issue.
I have added a field into the commerce product, and trying to calculate two custom field. When i am saving a product below warning is showing.
Pls advise to solve this issue.

Strict warning: Only variables should be passed by reference in eval() (line 1 of C:\wamp\www\commercedev\sites\all\modules\computed_field\computed_field.module(394) : eval()'d code).