I keep seeing the error below a lot on my logs. How do I fix this? is this a bug?

Feb 2 00:14:05 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmamavisdctl: (Cannot run program "/opt/zimbra/bin/zmamavisdctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:14:05 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmclamdctl: (Cannot run program "/opt/zimbra/bin/zmclamdctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:14:05 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/ldap: (Cannot run program "/opt/zimbra/bin/ldap" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:14:05 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmloggerctl: (Cannot run program "/opt/zimbra/bin/zmloggerctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:14:05 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmstorectl: (Cannot run program "/opt/zimbra/bin/zmstorectl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:14:05 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmmailboxdctl: (Cannot run program "/opt/zimbra/bin/zmmailboxdctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:14:05 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmmemcachedctl: (Cannot run program "/opt/zimbra/bin/zmmemcachedctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:14:06 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/postfix: (Cannot run program "/opt/zimbra/bin/postfix" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:14:06 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmsaslauthdctl: (Cannot run program "/opt/zimbra/bin/zmsaslauthdctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:14:06 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmswatchctl: (Cannot run program "/opt/zimbra/bin/zmswatchctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:14:06 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmspellctl: (Cannot run program "/opt/zimbra/bin/zmspellctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:14:06 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmstatctl: (Cannot run program "/opt/zimbra/bin/zmstatctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:14:06 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmclamdctl: (Cannot run program "/opt/zimbra/bin/zmclamdctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:14:06 zmconfigd CRITICAL [21059-rewrites-312] File "/opt/zimbra/zimbramon/pylibs/state.py", line 683, in rewriteConfig os.unlink(to)
Feb 2 00:14:06 zmconfigd CRITICAL [21059-rewrites-312] File "/opt/zimbra/lib/jars/jython-2.5.1.jar/Lib/os.py", line 342, in remove raise OSError(0, "couldn't delete file", path)
Feb 2 00:14:06 zmconfigd CRITICAL [21059-rewrites-312] Rewrite failed: [Errno 0] couldn't delete file: '/opt/zimbra/postfix/conf/master.cf' ([Errno 0] couldn't delete file: '/opt/zimbra/postfix/conf/master.cf')
Feb 2 00:15:06 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmamavisdctl: (Cannot run program "/opt/zimbra/bin/zmamavisdctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:15:06 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmclamdctl: (Cannot run program "/opt/zimbra/bin/zmclamdctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:15:06 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/ldap: (Cannot run program "/opt/zimbra/bin/ldap" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:15:06 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmloggerctl: (Cannot run program "/opt/zimbra/bin/zmloggerctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:15:06 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmstorectl: (Cannot run program "/opt/zimbra/bin/zmstorectl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:15:06 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmmailboxdctl: (Cannot run program "/opt/zimbra/bin/zmmailboxdctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:15:06 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmmemcachedctl: (Cannot run program "/opt/zimbra/bin/zmmemcachedctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:15:06 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/postfix: (Cannot run program "/opt/zimbra/bin/postfix" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:15:06 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmsaslauthdctl: (Cannot run program "/opt/zimbra/bin/zmsaslauthdctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:15:06 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmswatchctl: (Cannot run program "/opt/zimbra/bin/zmswatchctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:15:06 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmspellctl: (Cannot run program "/opt/zimbra/bin/zmspellctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:15:06 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmstatctl: (Cannot run program "/opt/zimbra/bin/zmstatctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:15:06 zmconfigd CRITICAL [21059-MainThread-2] Exception in bin/zmclamdctl: (Cannot run program "/opt/zimbra/bin/zmclamdctl" (in directory "/root"): java.io.IOException: error=13, Permission denied)
Feb 2 00:15:06 zmconfigd CRITICAL [21059-rewrites-319] File "/opt/zimbra/zimbramon/pylibs/state.py", line 683, in rewriteConfig os.unlink(to)
Feb 2 00:15:06 zmconfigd CRITICAL [21059-rewrites-319] File "/opt/zimbra/lib/jars/jython-2.5.1.jar/Lib/os.py", line 342, in remove raise OSError(0, "couldn't delete file", path)
Feb 2 00:15:06 zmconfigd CRITICAL [21059-rewrites-319] Rewrite failed: [Errno 0] couldn't delete file: '/opt/zimbra/postfix/conf/master.cf' ([Errno 0] couldn't delete file: '/opt/zimbra/postfix/conf/master.cf')