I did a fresh checkout and the warnings went away for me.
Edit: I do a fresh checkout in a non-standard way because of my slow internet connection.
I delete everything in my CB folder except the .svn folder.
Then, I do this command three times till nothing is updated on the third time.
It normally errors out on the first time done.
Updates the external stuff on the second time.
And, on the third time it just displays the svn revs.
Tim S.