GuildGui1b

Error while running the chunk
  [string "Mods/Addons/GuildGui1b/Scripts/ScriptGuildGui1b.lua"]:335: attempt to index a nil value
  func: __index, metamethod, line: -1, defined: C, line: -1, [C]
    func: CreateBase, global, line: 335, defined: Lua, line: 234, [string "Mods/Addons/GuildGui1b/Scripts/ScriptGuildGui1b.lua"]
      func: CreateList, global, line: 440, defined: Lua, line: 437, [string "Mods/Addons/GuildGui1b/Scripts/ScriptGuildGui1b.lua"]
        func: outputList, global, line: 102, defined: Lua, line: 97, [string "Mods/Addons/GuildGui1b/Scripts/ScriptGuildGui1b.lua"]
          func: ?, ?, line: 162, defined: Lua, line: 150, [string "Mods/Addons/GuildGui1b/Scripts/ScriptGuildGui1b.lua"]