If you only have one Guardian - Argent Guard - and you used it to lock your wallet, you need to wait for the locking security period, of five days, to expire. After this period you'll be free to carry on enjoying the wallet.
Why can't you use Argent Guard to unlock your wallet?
The reason is to be extra-secure. If you locked your wallet because someone has access to your phone, we didn't want them to be able to unlock it if they have access to your email too.