what is meaning of this error? :/

hello I just playing on my own DarkRP server when this error happen:

[ERRPR] gamemode/modules/police/sh_init.lua:169: attempt to call field ‘GetAll’ (a nil value)

  1. player - gamemode/modules/police/sh_init.lua:169
  2. unknown - lua/includes/modules/hook.lua:84

what does it mean and how to fix it?

[editline]7th September 2016[/editline]

nevermind was just server develeper troleing me , sorry