How can I fix an error while retrieving information from server.[RPC:s-7:aec-7 srfl-sabq-AWDQG?

[shashikamax]

(error while retrieving information from server.[RPC:s-7:aec-7 srfl-sabq-AWDQG

hai to day i do a factory reset to my Samsung galaxy s duos,after the reset i cant download the play store apps.when i going to to download this message will occurs (error while retrieving information from server.[RPC:s-7:aec-7 srfl-sabq-AWDQG] NEED A BIG HELP !!