Hello, I am unable to complete a purchase from this seller: Seller: mattz247(3,791) because there is an address problem. How can I validate it?

Item ID: 187831015231
Amr Diab - Allem Alby/Aktar Wahed/ليلي نهاري
Buy It Now: GBP 39.99
Your offer: GBP 25.00
Offer expires: Apr-01 11:40:00 PDT