Hey forch,
I'm having the same problem and followed the steps. Still get the message "interface en0 does not exist".
Here's the output:
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
options=3<RXCSUM,TXCSUM>
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
inet 127.0.0.1 netmask...