I'm trying to run the following command in Terminal: 

```
chown -R couchdb:couchdb /usr/local/var/log/couchdb

```

However, I keep getting this message:

```
chown: couchdb: illegal group name

```

I am using mac osx (mountain lion) and I have command line tools installed. I really don't know very much about unix, but I've been googling the illegal group name error and haven't turned up anything that would help. What am I overlooking? Any additional resources you think might be helpful also appreciated.