WHY got the strange strack trace ?!

[cqgreen]

NullReferenceException: Object reference not set to an instance of an object
UniLua.BytesLoadInfo.PeekByte ()
UniLua.LuaState.F_Load (UniLua.LoadParameter& param)
UniLua.LuaState.D_RawRunProtected[LoadParameter](UniLua.PFuncDelegate1 func, UniLua.LoadParameter& ud) UniLua.LuaState.D_PCall[LoadParameter](UniLua.PFuncDelegate1 func, UniLua.LoadParameter& ud, Int32 oldTopIndex, Int32 errFunc)
UniLua.LuaState.UniLua.ILuaAPI.Load (ILoadInfo loadinfo, System.String name, System.String mode)
UniLua.LuaState.L_LoadBytes (System.Byte[] bytes, System.String name)
UniLua.LuaState.UniLua.ILuaAPI.Call (Int32 numArgs, Int32 numResults)

ILuaAPI.Call does not invoke L_LoadBytes ~~~