global class shipmentHandler{
    webservice static void copyPPtoSP(String strRecId){
        list<Shipment_Product__c> lstSP = new list <Shipment_Product__c>();

        List<ProjectProduct__c> lstPP = [Select Id
        , Quantity__c
        , Line_Description__c
        , List_Price__c
        , Product__c
        , Sales_Price__c
        , Total_Price__c
        , Unit__c
        , Project__c
        from ProjectProduct__c
        where Project__c =: strRecId];

        if(lstPP != null && !lstPP.isEmpty()){
            Shipment__c objShipment = new Shipment__c();
            objShipment.Name = lstPP[0].Project_r.Name;
            objShipment.Project__c = lstPP[0].Project__c;
            insert objShipment;

            for(ProjectProduct__c objO : lstPP){
                Shipment_Product__c objProd = new Shipment_Product__c();
                objProd.Name = objO.Name;
                objProd.Product__c = objO.Product__c;
                objProd.List_Price__c = objO.List_Price__c;
                objProd.Sales_Price__c = objO.Sales_Price__c;
                objProd.Quantity__c = objO.Quantity__c;
                objProd.Line_Description__c = objO.Line_Description__c;
                objProd.Unit__c = objO.Unit__c;
                objProd.ShipmentLookup__c = objShipment.Id;
                lstSP.add(objProd);
            }
        }
        if(!lstSP.isEmpty()){
            insert lstSP;
        }
    }
}

I'm basically trying to copy over the project products to the shipment custom object I made. They will be stored in Shipment products. But I keep getting an error: 

"No such column 'Project__c' on entity 'ProjectProduct__c'. If you are attempting to use a custom field, be sure to append the '__c' after the custom field name. Please reference your WSDL or the describe call for the appropriate names."

Need help. Please.