Make error message more descriptive

Tested:
Verified on a machine with two host nodes.
https://paste.googleplex.com/5628863337725952?raw

Google-Bug-Id: 386135750
Change-Id: I32379a6233fa9277b993f8941b6e702b6f22704e
Signed-off-by: Medicine Yeh <medicineyeh@google.com>
3 files changed