Could not compute price

[Headboards]

Good day all. I am getting this error everytime someone places an order on my store . Who can help me please ?

The price for the cart below could not be computed.
Rates explained: ["Test mode - cart address 2 does not match expected test address"].
Details: [{"customerInfo":{"name":"Slindokuhle Mthombeni","destination":{"country":"ZA","province":"GT","postalCode":"1684"},"email":""},"cartItems":["https://headboardsforafricaonline.myshopify.com/admin/products/6157667012/variants/50519979268","https://headboardsforafricaonline.myshopify.com/admin/products/11307954820/variants/43943657348"],"correlationId":"ae0408b6-8994-43f9-996b-d1e217bf6648"}].
The initial cart: {"rate":{"origin":{"country":"ZA","postal_code":"7850","province":"WC","city":"cape town","name":null,"address1":"67 main road Diep River","address2":"","address3":null,"phone":"0820758333","fax":null,"email":null,"address_type":null,"company_name":"Headboards For Africa "},"destination":{"country":"ZA","postal_code":"1684","province":"GT","city":"JOHANNESBURG","name":"Slindokuhle Mthombeni","address1":"CORNER ETHEL AND WHISKEN AVENUE - THE WHISKEN","address2":"UNIT 69, BLOCK 8","address3":null,"phone":"0679267427","fax":null,"email":null,"address_type":null,"company_name":""},"items":[{"name":"Stud Trim Headboard - Queen","sku":"","quantity":1,"grams":0,"price":272799,"vendor":"Headboards For Africa ","requires_shipping":true,"taxable":true,"fulfillment_service":"manual","properties":{"Plain Upholstery Linen":"RE CREAM"},"product_id":6157667012,"variant_id":50519979268},{"name":"Upholstered Bed Base - Queen","sku":"","quantity":1,"grams":0,"price":209900,"vendor":"Headboards For Africa ","requires_shipping":true,"taxable":false,"fulfillment_service":"manual","properties":{"Plain Upholstery Linen":"RE CREAM"},"product_id":11307954820,"variant_id":43943657348}],"currency":"ZAR","locale":"en"}}.