c#与LUA交互问题

[spider_xm]

Lua lua = new Lua();
lua.DoFile(@"c:\transfer.lua");

lua脚本如下

require "date"
print("hello world")

运行出错，

c:\transfer.lua:3: module 'date' not found:
no field package.preload['date']
no file '.\date.lua'
no file 'D:\Backup\Visual Studio 2008\Projects\luatest\luatest\bin\x86\Debug\lua\date.lua'
no file 'D:\Backup\Visual Studio 2008\Projects\luatest\luatest\bin\x86\Debug\lua\date\init.lua'
no file 'D:\Backup\Visual Studio 2008\Projects\luatest\luatest\bin\x86\Debug\date.lua'
no file 'D:\Backup\Visual Studio 2008\Projects\luatest\luatest\bin\x86\Debug\date\init.lua'
no file 'd:\Program Files (x86)\Lua\5.1\lua\date.luac'
no file '.\date.dll'
no file 'D:\Backup\Visual Studio 2008\Projects\luatest\luatest\bin\x86\Debug\date.dll'
no file 'D:\Backup\Visual Studio 2008\Projects\luatest\luatest\bin\x86\Debug\loadall.dll'


为什么呢，怎么解决