Please make sure that you are entering your wallet address, and not your wallet ID.
Your wallet ID is like a username you'd use to log in to an account. To log into your wallet, you'd use your Wallet ID and password.
However, your wallet address is more like an email address that we require to send the bitcoin to you.
To find your wallet address, please go into your wallet and select the "Receive" or "Request" option. The address should begin with a 1 or a 3 and look something like this: 14Bak3p583GRxK5DVuKJzQxxLPJxJVDDK4