How can I fix an error message I am getting when I try to download?

[AC Question]

when i am trying to download i am receiving an error message like this:-

when i am trying to download i am receiving an error message like this:- "WhatsApp Messenger" could not be downloaded due to an error. (Error retreiving information from server. [RPC: S-7:AEC-7 OCVM-VSQR-UMKZE])