What's up with that?
I had posted this earlier but hadn't seen a response.
The probable cause for this is that your wallets are not completely sync yet with the network, once they are , then try again to add address.
I finally got the wallets to sync but I still have this problem. Normally the address box is grayed out but when I click new address I can type something in for the Label and Address.
Is this happening on both wallets? Windows wallets? Can you provide a snapshot?
Now the wallets aren't synced right now because I had tried re-downloading them but this is the same error i get when they are synced.
Basically what you need is to get your yin and yang coin wallet address. You need to click on that "Receive" Button to get your Wallet address. The one you are trying to click is for the address you need to have transaction with. You need to put the label and then the appropriate address and click okay to you can add them to your address book.
request the new address after you finished syncing the wallet first.