Gmod错误 darkrp lua脚本

我需要关于这个 LUA 文件的帮助，但我没有编辑过这个文件，它是一个下载的文件。

ADDON包是 M9K Specialties，用于 GMOD 服务器。

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我的错误消息是：

[ERROR] gamemodes/darkrp/entities/weapons/m9k_davy_crockett/shared.lua:1: attempt to index a nil value

1. unknown - gamemodes/darkrp/entities/weapons/m9k_davy_crockett/shared.lua:1

这是文件：

我只复制了前10行，但错误在第1行。

1) if not (GetConVar("DavyCrockettAllowed"):GetBool()) then return end
2) -- Variables that are used on both client and server
3) SWEP.Gun = ("m9k_davy_crockett") -- must be the name of your swep but NO CAPITALS!
4) SWEP.Category                = "M9K Specialties"
5) SWEP.Author              = ""
6) SWEP.Contact             = ""
7) SWEP.Purpose             = ""
8) SWEP.Instructions                = ""
9) SWEP.MuzzleAttachment            = "1"   -- Should be "1" for CSS models or 10) "muzzle" for hl2 models
10) SWEP.ShellEjectAttachment           = "2"   -- Should be "2" for CSS models or "1" for hl2 models