Moxi returns errors during rebalance

During rebalance in of new node and running mc-loader check here's what I'm getting:

root@tau:~/src/altoros/moxi/mc-loader# ./generate-keyset.rb -k 2700100 -v 1 | pv -letpr -s 2700100 | ./parallelize-lines 32 ./mc-loader dn2:11211 - check valuesize 302
Failed to get: 02533522, memcached failure 16 (NOT FOUND) ] 9% ETA 0:01:30
Failed to get: 02530071, memcached failure 16 (NOT FOUND)
Failed to get: 02529847, memcached failure 16 (NOT FOUND)
Failed to get: 02540834, memcached failure 16 (NOT FOUND)
Failed to get: 02528631, memcached failure 16 (NOT FOUND)
Failed to get: 02530693, memcached failure 16 (NOT FOUND)
Failed to get: 02539638, memcached failure 16 (NOT FOUND) ] 10% ETA 0:01:33
Failed to get: 02529074, memcached failure 16 (NOT FOUND)
Failed to get: 02539700, memcached failure 16 (NOT FOUND)
Failed to get: 02529696, memcached failure 16 (NOT FOUND)
Failed to get: 02538566, memcached failure 16 (NOT FOUND)
Failed to get: 02538637, memcached failure 16 (NOT FOUND)
Failed to get: 02537884, memcached failure 16 (NOT FOUND)
Failed to get: 02537494, memcached failure 16 (NOT FOUND)

Next time (still during rebalance) and after rebalance everything works.