Ridiculous error on all google play store Using CM 10.1.3
This error can have multiple causes. Some are explained on our sister site, in Error while retrieving information from the server RPC:s-7:AEC-0 in Google play?:


  turns out my credit card info on file needed updated to my new expiration date.


is one possibility. One more:


  RPC:AEC:0 error is known as CPU/RAM/Device/Identity failure.
  
  
  Go to settings >application > Play Store >Clear Data &amp; Clear Cache.
  Go to accounts >Google >Remove account.
  Reboot device.
  Again Settings>Account >Google >Log In.
  


Another reason is explained on AndroidPIT (German): It could be problems with Google servers (same is, btw, reported by users in this thread on AndroidForums.Com). One user reported a work around that did it for him: He tried it at least 10 times on his Android device, without success. So he simply fired up the browser on his computer, and tried it from there -- which immediately worked.

For more details (and possible other solutions/work-arounds), just follow the other results from this Google search.