Error while loading GMOD9 server

[Rotz]

Well, I am running a dedicated server on one computer for GMOD 9.0.4. Everytime I(or anyone else) try to join it, the loading screen freezes at "Sending Client Info" and then times out to the main menu. Noticing this, I checked the server log and I found that the error: [LUA] Error calling 'DoEventHook' : 'Line 7: attempt to index field '?' (a nil value)' kept appearing. Quite honestly, I have no idea what that could possibly be. It does have a few RP mods on it.. (which I can't get to work either, if anyone has any knowledge about that).. but I don't know how to fix it. Any help would be appreciated, thanks.

Heres the server log:

VAC secure mode is activated.
Client "Jeremy" connected (**.**.***.***:*****).
Client "Cloud" connected (***.**.**.**:*****).
[LUA] Error calling 'DoEventHook' : 'Line 7: attempt to index field '?' (a nil value)'
Dropped Cloud from server (Disconnect by user.)
Client "Cloud" connected (***.**.**.**:*****).
[LUA] Error calling 'DoEventHook' : 'Line 7: attempt to index field '?' (a nil value)'
Dropped Cloud from server (Disconnect by user.)
[LUA] Error calling 'DoEventHook' : 'Line 7: attempt to index field '?' (a nil value)'
Dropped Jeremy from server (Jeremy timed out)
Client "Jeremy" connected (**.**.***.***:*****).
[LUA] Error calling 'DoEventHook' : 'Line 7: attempt to index field '?' (a nil value)'
Dropped Jeremy from server (Jeremy timed out)

[Drocona]

Well based on the DoEventHook function it's a mod/plugin that isn't doing its job correctly, try to disable them one by one to see if it solves the problem.

[Rotz]

Thanks for the help. I just reinstalled the addons and it they all worked perfectly.