RHEL 6 boot error after update to 6.7

Hello. I have RHEL 6 production server on HP ProLiant DL380 G5 server. After update to 6.7 the following error is on boot time (see attached picture). When I reboot server and select other kernel used before, server boots normally. The same problem were seen during some kernels earlier. Server uses P400 RAID 5 logical drive and has USB 1 TB external drive mounted boot time for backups.

Great thanks for any help.