Error in monit 5.18 Cannot activate service check. The process status engine was disabled.

We upgrade up to monit 5.18 and see errors when start monit on some servers.

Part of config:

check system localhost
    group system
    group admin
    if memory usage > 95% for 3 cycles then alert
    if memory usage > 90% for 5 cycles then alert
    if swap usage > 25% for 5 cycles then alert
    if cpu usage > 95% for 5 cycles then alert

# uname -a Linux localhost 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt20-1+deb8u4 (2016-02-29) x86_64 GNU/Linux

# monit -vv
system statistic error -- cannot get system boot time
Adding host allow 'localhost'
Adding net allow '127.0.0.1'
Adding net allow '78.47.64.63'
Adding net allow '172.31.1.100'
Adding credentials for user 'monit'
Adding credentials for user 'admin'
/etc/monitrc:26: Cannot activate service check. The process status engine was disabled. On certain systems you must run monit as root to utilize this feature)
 'if'
-------------------------------------------------------------------------------
    monit() [0x41b6b3]
    monit() [0x41be0f]
    monit() [0x4055c7]
    monit() [0x40d2f7]
    monit() [0x40d9d8]
    monit() [0x411f4b]
    monit() [0x4132f5]
    /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) [0x7fc381d2eb45]
    monit() [0x404d2a]
-------------------------------------------------------------------------------
/etc/monitrc:27: Cannot activate service check. The process status engine was disabled. On certain systems you must run monit as root to utilize this feature)
 'if'
-------------------------------------------------------------------------------
    monit() [0x41b6b3]
    monit() [0x41be0f]
    monit() [0x4055c7]
    monit() [0x40d2f7]
    monit() [0x40d9d8]
    monit() [0x411f4b]
    monit() [0x4132f5]
    /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) [0x7fc381d2eb45]
    monit() [0x404d2a]
-------------------------------------------------------------------------------
/etc/monitrc:28: Cannot activate service check. The process status engine was disabled. On certain systems you must run monit as root to utilize this feature)
 'if'
-------------------------------------------------------------------------------
    monit() [0x41b6b3]
    monit() [0x41be0f]
    monit() [0x4055c7]
    monit() [0x40d2f7]
    monit() [0x40d9d8]
    monit() [0x411f4b]
    monit() [0x4132f5]
    /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) [0x7fc381d2eb45]
    monit() [0x404d2a]
-------------------------------------------------------------------------------
/etc/monitrc:29: Cannot activate service check. The process status engine was disabled. On certain systems you must run monit as root to utilize this feature)
 'if'
-------------------------------------------------------------------------------
    monit() [0x41b6b3]
    monit() [0x41be0f]
    monit() [0x4055c7]
    monit() [0x40d2f7]
    monit() [0x40d9d8]
    monit() [0x411f4b]
    monit() [0x4132f5]
    /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) [0x7fc381d2eb45]
    monit() [0x404d2a]
-------------------------------------------------------------------------------

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