Need Urgent Help

[1CinnamonTr0lls]

Hello, I own a DarkRP server. And lately a lot of weird things have been happening.

All of them have been fixed except for one, which no one at support can figure out. I haven't edited any base files in anyway, FYI. So the problem is, is a staff member will be playing, and sooner or later they'll get a screen like this http://gyazo.com/539c5c2931248a585fee6668122ded2c

And you have to force close gmod out. One of my staff members caught this LUA error.

3. unknown - gamemodes/sandbox/entities/entities/gmod_light.lua:64


[ERROR] gamemodes/sandbox/entities/entities/base_gmodentity.lua:19: attempt to call method 'GetEyeTrace' (a nil value)
1. BeingLookedAtByLocalPlayer - gamemodes/sandbox/entities/entities/base_gmodentity.lua:19
2. Think - gamemodes/sandbox/entities/entities/base_gmodentity.lua:30
3. unknown - gamemodes/sandbox/entities/entities/gmod_light.lua:64


[ERROR] gamemodes/sandbox/entities/entities/base_gmodentity.lua:19: attempt to call method 'GetEyeTrace' (a nil value)
1. BeingLookedAtByLocalPlayer - gamemodes/sandbox/entities/entities/base_gmodentity.lua:19
2. unknown - gamemodes/sandbox/entities/entities/base_gmodentity.lua:30


[ERROR] gamemodes/sandbox/entities/entities/base_gmodentity.lua:19: attempt to call method 'GetEyeTrace' (a nil value)
1. BeingLookedAtByLocalPlayer - gamemodes/sandbox/entities/entities/base_gmodentity.lua:19
2. unknown - gamemodes/sandbox/entities/entities/base_gmodentity.lua:30


[ERROR] gamemodes/sandbox/entities/entities/base_gmodentity.lua:19: attempt to call method 'GetEyeTrace' (a nil value)
1. BeingLookedAtByLocalPlayer - gamemodes/sandbox/entities/entities/base_gmodentity.lua:19
2. unknown - gamemodes/sandbox/entities/entities/base_gmodentity.lua:30


[ERROR] gamemodes/sandbox/entities/entities/base_gmodentity.lua:19: attempt to call method 'GetEyeTrace' (a nil value)
1. BeingLookedAtByLocalPlayer - gamemodes/sandbox/entities/entities/base_gmodentity.lua:19
2. unknown - gamemodes/sandbox/entities/entities/base_gmodentity.lua:30


[ERROR] gamemodes/sandbox/entities/entities/base_gmodentity.lua:19: attempt to call method 'GetEyeTrace' (a nil value)
1. BeingLookedAtByLocalPlayer - gamemodes/sandbox/entities/entities/base_gmodentity.lua:19
2. unknown - gamemodes/sandbox/entities/entities/base_gmodentity.lua:30


[ERROR] gamemodes/sandbox/entities/entities/base_gmodentity.lua:19: attempt to call method 'GetEyeTrace' (a nil value)
1. BeingLookedAtByLocalPlayer - gamemodes/sandbox/entities/entities/base_gmodentity.lua:19
2. unknown - gamemodes/sandbox/entities/entities/base_gmodentity.lua:30


[ERROR] gamemodes/sandbox/entities/entities/base_gmodentity.lua:19: attempt to call method 'GetEyeTrace' (a nil value)
1. BeingLookedAtByLocalPlayer - gamemodes/sandbox/entities/entities/base_gmodentity.lua:19
2. unknown - gamemodes/sandbox/entities/entities/base_gmodentity.lua:30


[ERROR] gamemodes/sandbox/entities/entities/base_gmodentity.lua:19: attempt to call method 'GetEyeTrace' (a nil value)
1. BeingLookedAtByLocalPlayer - gamemodes/sandbox/entities/entities/base_gmodentity.lua:19
2. unknown - gamemodes/sandbox/entities/entities/base_gmodentity.lua:30

And it repeats itself over and over and over again.

Now heres the catch, once my staff member rejoins, his rank is gone. We have no idea how this happens, but I am very worried I have either a hacker/exploiter/backdoor in my files or some sort. If anyone could help me that'd be greatly appreciated.

[Famous]

Try replacing that file