You need to have 3 references that are willing to be contacted on your behalf. They want 2 from your current employer, and 1 from a previous employer. All they want is a name, position, e-mail, and phone #.
They sent out an "errored" e-mail to my references, then e-mailed me and said they were having trouble contacting them. I contacted the ref, they replied with my recommendation, one even asked for a reply, and received it.
Guns