I installed a new Time Capsule to replace an AEBS. I ran an initial Time Machine backup using an ethernet cable to speed things up. No issue. I did a couple of more using WiFi. Now I am getting this error message. What does this mean, and how do I correct? FWIW I had an external USB drive connected to my AEBS which I used for Time Machine in the past with no real issues. Now have that connected to the Time Capsule as a storage device, but it's not allowing me to delete files nor can I see it in disk utility. Don't know if that is relevant.