Welcome to the forum!
I have no clue what the error means, but I have 2 suggestions:
Open the app called Settings then go to Apps - All - Play Store - Force Close then Clear Data.
Open the Play Store, accept the terms and see if it works.
Second option to try - back in Settings - Accounts & Sync - Select your Google account - 3 Boxes in top right - Remove Account.
Settings - Accounts & Sync - Add Account (and add your Google account back).