You would usually get this error when trying to install an app while Google Play Store is updating or stuck at updating. Some fixes to consider are:
Wait for Google Play Store to finish updating and restart the phone
Force stop then clear Google Play Store data & cache: Go to Settings > Applications > All > Google Play Store > Force stop > Clear data > Clear cache
Clear Google Play Services data & cache: Go to Settings > Applications > All > Google Play Services > Clear data > Clear cache
Force stop then clear Google Service Framework data & cache: Go to Settings > Applications > All > Google Service Framework > Force stop > Clear data > Clear cache
Force stop then clear Download manager data & cache: Go to Settings > Applications > All > Download manager > Force stop > Clear data > Clear cache
Remove then re-add Google account: Go to Settings > Accounts > Google > Select your Google account > Press menu button > Remove account > Restart the phone > Add the Google account again