I get this error when I am trying to hack my wifi. I wanted to test the security of my Westell Versalink 327W (back from 2006) It is an old fart which is soon to be getting replaced actually today. I decided to try hacking other people's wifi, just to see if it would associate which did. After the first few seconds I cut the attack off and tried on mine again same error as usual.
This is what I am using: "reaver -i mon0 -b 00:00:00:00:00:00 -vv"
I don't know if I did it right or not.