Not able to install any applications from play store

[Wasu]

I am unable to install any app from play store. I am connected with wi-fi connection and also able to view applications. However, when i puch update button it shows me error "RPC:S-7:AEC-7". Please help me.

[Uliwooly]

Settings > accounts > google > delete the google account > restart your phone > re-add the account > check again 

[Uliwooly]

Also

settings > apps > all > Play store > clear data > restart your phone > check again