Why is my android giving me this error message?

My service just got disconnected and I am trying to download an app in the play store so I can text over wifi, which I have done before. Now when I try to download the app I get error rpc:s-5:aec-0 or I get error 927. I have gone into the app manager and force stopped the play store and cleared data. I have... show more My service just got disconnected and I am trying to download an app in the play store so I can text over wifi, which I have done before. Now when I try to download the app I get error rpc:s-5:aec-0 or I get error 927. I have gone into the app manager and force stopped the play store and cleared data. I have toggled the mobile network on and off. I have restarted the device. I am still getting the error! HELP!!!!!!
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