My server is creating script errors?

[ColonelCow]

I run a Jailbreak server, but in the top corner there is the "something is creating script errors" sign. I went on the console and this was here:

[ERROR] gamemodes/jailbreak/gamemode/cl_hooks.lua:332: attempt to call method 'PreDrawHalos' (a nil value)
1. Run - gamemodes/jailbreak/gamemode/cl_hooks.lua:332
2. v - lua/includes/modules/halo.lua:163
3. unknown - lua/includes/modules/hook.lua:84

Any ideas on how to fix it? I'm not that knowledgeable about this stuff.