Why am I receiving the error RPC:S-2:AEC-2?

[AC Question]

RPC:S-2:AEC-2

Why am I receiving error RPC:S-2:AEC-2 when I try to download Facebook on my HTC One M7 right after I updated android version 5.0.2?

 

[B. Diddy]

Re: RPC:S-2:AEC-2

Welcome to Android Central! Go to Settings>App Manager>All, select Google Play Store, and Clear Cache/Clear Data, then Force Stop. Do the same for Download Manager. Now try again.

If that doesn't work, go to Settings>Accounts​, remove your Google account, then add it back again.