ERROR WHEN DOWNLOADING AN E-BOOK!!

Dear Sir,

I bought today a book called :

Fundamentals of Earthquake Engineering: From Source to Fragility, 2nd Edition

ISBN:  1118700473

Author: Elnashai        (John Wiley)

Qty:        1

Price:  £73.99

VAT:    £0.00

Total:  £73.99

i'm getting error when I try to download the e-book as below :

    so what shall I do , can you help me plz?

and this is the purchase order