bug fix: fix the string format.

a "s" should be subfix in string format.

Signed-off-by: ShaoHe Feng <shaohef@linux.vnet.ibm.com>
Fix a typo.

Signed-off-by: Leonardo Garcia <lagarcia@br.ibm.com>
error message fix.

This error message is not obscure.
Fix it.

Signed-off-by: ShaoHe Feng <shaohef@linux.vnet.ibm.com>
Signed-off-by: Aline Manera <alinefm@linux.vnet.ibm.com>