These errors?

[Kossan]

Hi, my server have got these errors sometimes could some1 please help me sort out what it is? And my server prob dies of it, And i dont know but my TTT preround safe is off. What i mean is the preround to find guns is off you can kill each other in preround in my TTT could some1 help me? And heres the errors that comes up

[ERROR] lua/autorun/server/ttt_perky_server.lua:30: attempt to call method 'GetClass' (a nil value)
 1. fn - lua/autorun/server/ttt_perky_server.lua:30
 2. unknown - addons/ulib/lua/ulib/shared/hook.lua:183
 3. FireBullets - [C]:-1
 4. ShootBullet - gamemodes/terrortown/entities/weapons/weapon_tttbase.lua:318
 5. PrimaryAttack - gamemodes/terrortown/entities/weapons/weapon_tttbase.lua:242
 6. unknown - addons/damagelog-master/lua/sv_damageinfos.lua:26

ERROR] lua/autorun/server/ttt_perky_server.lua:30: attempt to call method 'GetClass' (a nil value)
 1. fn - lua/autorun/server/ttt_perky_server.lua:30
 2. unknown - addons/ulib/lua/ulib/shared/hook.lua:183

[Neku]

Get rid of ttt_perky_server. It's a buggy addon.