Fehler Code E20 Aeg Xbox Live Code Wont Work!?

Xbox live code wont work!? - fehler code e20 aeg

I typed and said: During the transaction, an error occurred. Please try again later. I live in Germany and that really means that an error was made in this transaction, please try again later, and I guess I do not know if it's because I U.S. shop and live in Germany and in English language on the back of the card, if it can help the money spent on it!