CBQE-0: fix error format

Change-Id: I2804d065f8dc5461b25361478386c4bb4474021c
Reviewed-on: http://review.couchbase.org/26025
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>
Tested-by: Iryna Mironava <irynamironava@yandex.ru>