I am running zimbra 7 and everyone in a while it crashes on Ubuntu 10.04. Look at this log file:

Code:
# tail /var/log/zimbra.log
Jun 16 13:00:23 zmconfigd CRITICAL [26718-MainThread-2] Exception in bin/zmstorectl: (Cannot run program "/opt/zimbra/bin/zmstorectl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Jun 16 13:00:23 zmconfigd CRITICAL [26718-MainThread-2] Exception in bin/zmmailboxdctl: (Cannot run program "/opt/zimbra/bin/zmmailboxdctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Jun 16 13:00:23 zmconfigd CRITICAL [26718-MainThread-2] Exception in bin/postfix: (Cannot run program "/opt/zimbra/bin/postfix" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Jun 16 13:00:23 zmconfigd CRITICAL [26718-MainThread-2] Exception in bin/zmsaslauthdctl: (Cannot run program "/opt/zimbra/bin/zmsaslauthdctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Jun 16 13:00:23 zmconfigd CRITICAL [26718-MainThread-2] Exception in bin/zmswatchctl: (Cannot run program "/opt/zimbra/bin/zmswatchctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Jun 16 13:00:23 zmconfigd CRITICAL [26718-MainThread-2] Exception in bin/zmspellctl: (Cannot run program "/opt/zimbra/bin/zmspellctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Jun 16 13:00:23 zmconfigd CRITICAL [26718-MainThread-2] Exception in bin/zmstatctl: (Cannot run program "/opt/zimbra/bin/zmstatctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Jun 16 13:00:23 zmconfigd CRITICAL [26718-MainThread-2] Exception in bin/zmclamdctl: (Cannot run program "/opt/zimbra/bin/zmclamdctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)

How would I fix this?