After choose 'product' in 'productScreen' and click 'customerButton' to view 'customerScreen' that view customer list and allow add new then 'setCustomer'. I incurred the error when click 'customerButton'. 

here's the error:

Uncaught Error: QWeb2 - template['ClientLine']: Runtime Error: TypeError: Cannot read properties of undefined (reading 'pos'). 

I find out location that throw the error is in 'pos_orders_list.xml'( t-if="env.pos.config.show_order">) :

t-name ="ClientLine" t-inherit ="point_of_sale.ClientLine" t-inherit-mode ="extension" owl ="1" > 
   expr ="//tr" position ="inside" > 
      t-if ="env.pos.config.show_order" > 
         class ='order-partner' t-att-data-id ='props.partner.id' 
         t-on-click.stop ="trigger(' click-show-orders',props.partner)" > 
            class ="fa fa-university"> View Orders  
         
       
    

​

Additionally, the info console window shows messages: 

Missing dependencies:

1. Array(8)
1. 0 : "point_of_sale.PosComponent"
2. 1 : "point_of_sale.AbstractAwaitablePopup"
3. 2 : "point_of_sale.Registries"
4. 3 : "web.custom_hooks"
5. 4 : "point_of_sale.ProductScreen"
6. 5 : "point_of_sale.custom_hooks"
7. 6 : "point_of_sale.ClientListScreen"
8. 7 : "point_of_sale.OrderReceipt"

Not loaded modules:

1. Array(6)
1. 0 : "pos_orders_list.PosOrdersDetail"
2. 1 : "pos_orders_list.SeePOSOrdersButton"
3. 2 : "pos_orders_list.POSOrdersScreen"
4. 3 : "point_of_sale.POSOrders"
5. 4 : "pos_orders_list.ClientListScreen"
6. 5 : "pos_orders_list.ReceiptScreen"
7. length : 6

I don't know add image in this post then can't explain more.