syseer error how i fix it?

[Calibur27]

SYSERR: Jul 18 19:09:46 :: number_ex: number(): first argument is bigger than second argument 450 -> 200, battle.cpp 415
SYSERR: Jul 18 19:13:29 :: ModifyPoints: cannot find table by vnum 28960
SYSERR: Jul 18 19:13:29 :: ModifyPoints: cannot find table by vnum 28960
SYSERR: Jul 18 19:13:31 :: Process: SEQUENCE 45259100 mismatch 0xaf != 0x0 header 254
SYSERR: Jul 18 19:13:31 :: Process: SEQUENCE_LOG [UNKNOWN]-------------
[254 : 0xaf]

SYSERR: Jul 18 19:13:31 :: SpawnMob: SpawnMob: no mob data for vnum 20097


i keep gettin this errors and server goes down why?what can i do?

[thehero09]

up up up up

[.iPaCHeL]

Hello,

SYSERR: Jul 18 19:13:31 :: SpawnMob: SpawnMob: no mob data for vnum 20097

Mob_proto -> New Mob with Vnum 20097