Blockchain: Error importing private key: Unable to add generated bitcoin address

[Topazan]

I keep a number of addresses in "watch only" mode on blockchain.info.  Today I tried importing one of my addresses so I could spend some coins.  When I tried to import one of my addresses with a brainwallet, I got a similar message.  When I used bitaddress to get the private key, I got this message.

Note: I got another error when I try importing another "watch only" address.