Backdoor error code

My backdoor is not working in my server

I'm using RunString to run lua code serverside from client side with one command but it's giving me this error

addons/garrysmod/lua/autorun/server/test.lua:3: bad argument #1 to 'RunString'

I type: run_serverside for k, v in pairs(player.GetAll()) do v:Kill() end)

Code:
concommand.Add("run_serverside", function(ply,command,args)
RunString(args)
end)

Help is appreciated

- - - Updated - - -

Should this fix it?
concommand.Add("run_serverside", function(ply,command,args)
RunString(table.concat(args))
end)

You're passing a table to RunString, not a string. Also this method won't let you run the command from your client, you'd still need access to the server to run the command.