Correct error message

The function that is mentioned in the error message got renamed.

Change-Id: I7fe6cbe743341529e9e97da0f7dc71ee59ce79bd
Reviewed-on: http://review.couchbase.org/27221
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Filipe David Borba Manana <fdmanana@gmail.com>