Somw errors problems

Hello ,
I have something like 100 RB411 in my work that have a wireless and PPP conection from a SIM card (I mean only modem and rf card).
all of them have v.50rc2 .

and in that last few weeks some of them have stop working - when I connect to them in console I see 4 type of errors:(not in the same time - every error in different RB)

press any key within 2 seconds to enter setup..
loading kernel from nand… OK
setting up elf image… OK
jumping to kernel code
Starting…
/etc/rc.d/rc.sysinit: 32: cannot create /var/run/utmp: Directory nonexistent
System halted.


2.Press any key within 2 seconds to enter setup..
loading kernel from nand… OK
setting up elf image… OK
jumping to kernel code
Starting…
/etc/rc.d/rc.mount: 11: [: not found
/etc/rc.d/rc.sysinit: 26: [: not found
/etc/rc.d/rc.sysinit: 59: [: not found
/etc/rc.d/rc.sysinit: 83: [: not found
/etc/rc.d/rc.sysinit: 88: [: not found
Segmentation fault
/etc/rc.d/rc.start: 19: [: not found
/etc/rc.d/rc.start: 19: [: not found
/etc/rc.d/rc.start: 19: [: not found
/etc/rc.d/rc.start: 19: [: not found
/etc/rc.d/rc.start: 19: [: not found
/etc/rc.d/rc.start: 19: [: not found
/etc/rc.d/rc.start: 19: [: not found
/etc/rc.d/rc.start: 19: [: not found
/etc/rc.d/rc.start: 19: [: not found
/etc/rc.d/rc.start: 19: [: not found
/etc/rc.d/rc.start: 19: [: not found
/etc/rc.d/rc.start: 19: [: not found
/etc/rc.d/rc.start: 19: [: not found
/etc/rc.d/rc.start: 19: [: not found

g up elf image… OK
jumping to kernel code
Starting…
insmod: /lib/modules/2.6.35/: No such file or directory
/etc/rc.d/rc.sysinit: 32: cannot create /var/run/utmp: Directory nonexistent
System halted.

4.Starting…
insmod: cannot insert `/lib/modules/2.6.35/misc/logring.ko’: Invalid module format (-1): Exec format error
modprobe: failed to load module logring
/etc/rc.d/run.d/S02logring: 10: cannot create /dev/log241: No such device or address
/etc/rc.d/run.d/S02panic: 2: cannot create /dev/log241: No such device or address
Jan 1 00:00:11 localhost syslog.info syslogd started: BusyBox v1.00 (2010.09.21-13:23+0000)
/etc/rc.d/run.d/S05syslog: 4: cannot create /dev/log240: No such device or address
/etc/rc.d/run.d/S06mipsdog: 2: cannot create /dev/log241: No such device or address
/etc/rc.d/run.d/S07rb: 3: cannot create /dev/log241: No such device or address
/etc/rc.d/run.d/S08softdog: 3: cannot create /dev/log241: No such device or address
Starting services…
/etc/rc.d/run.d/S10nova: 29: cannot create /dev/log1: No such device or address

Fatal error 0x853
Please contact support@mikrotik.com


can some one please tell me what are they mean? or what do I need to change in others that are working that they wont stop working?

thank you!

anyone seen this errors once?

I want to know what I did wrong

thx,