need help darkrp

[ERROR] A runtime error has occurred in "addons/darkrpmodification-master_gmchosting/lua/darkrp_customthings/jobs.lua" on line 30.
The best help I can give you is this:

A table is being indexed by something that does not exist (table index is nil).

Hints:
- The thing between square brackets does not exist (is nil).

The responsibility for the error above lies with (the authors of) one (or more) of these files:
1. addons/darkrpmodification-master_gmchosting/lua/darkrp_customthings/jobs.lua on line 30
2. gamemodes/darkrp/gamemode/libraries/fn.lua on line 84
3. gamemodes/darkrp/gamemode/libraries/fn.lua on line 84
4. gamemodes/darkrp/gamemode/libraries/modificationloader.lua on line 138
5. gamemodes/darkrp/gamemode/libraries/modificationloader.lua on line 149
6. gamemodes/darkrp/gamemode/init.lua on line 111
------- End of Simplerr error -------

[ERROR] A runtime error has occurred in "gamemodes/darkrp/gamemode/modules/base/sv_gamemode_functions.lua" on line 714.
The best help I can give you is this:

DarkRP was unable to introduce player "greygod" to the game. Expect further errors and shit generally being fucked!

Hints:
- This error most likely does not stand on its own, and previous serverside errors have a very good chance of telling you the cause.
- Note that errors from another addon could cause this. Specifically when they're thrown during 'PlayerInitialSpawn'.
- This error can also be caused by some other addon returning a value in 'PlayerInitialSpawn', though that is less likely.
- Errors in your DarkRP configuration (jobs, shipments, etc.) could also cause this. Earlier errors should tell you when this is the case.

The responsibility for the error above lies with (the authors of) one (or more) of these files:

------- End of Simplerr error -------

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please help i dont know how to fix it i like to get replies