Error log Content:"Invalid method MDN_AdvancedStock_Model_Sales_Order_Shipment::prepareGridCollection(Array( =>)"The module MDN_AdvancedStock is conflicting with our canada post module. I would suggest disabling the module MDN_AdvancedStock if it is not absolutly needed.If this error log content is similar to the content that you see in your log file. Try to disable the module mentions after "Invalid method", after the module is disabled try to reproduce the error.
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