in c++, luabridge::LuaRef:no appropriate default constructor available - c++

Question

I write a lua script and want to parse the script by c++ codes. In this script I have functions, and I want to get the function and save it for usage in the future. The main.cpp is like
#include <string>
#include <iostream>
#include "luaParser.h"
#include "LuaBridge.h"
extern "C" {
# include "lua.h"
# include "lauxlib.h"
# include "lualib.h"
}
using namespace luabridge;
void main (void)
{
lua_State* L = luaL_newstate();
if (luaL_dofile(L, "P3626_PORT.lua"))
{
printf("%s\n", lua_tostring(L, -1));
}
luaL_openlibs(L);
lua_pcall(L, 0, 0, 0);
LuaParser parser;
parser.luaParse(L); // get some values from the luaParser::luaParse function
lua_close(L);
parser.run(); // call the run function defined in LuaParser class
parser.stop(); // call the stop function defined in LuaParser class
}
The P3626_PORT.lua is like:
lua_name = "P3626_PORT.lua"
run = function()
print (" this is my input!!!!!!!")
end
stop = function()
print (" this is my output!!!!!!!")
end
The luaParser.h is like:
#pragma once
#include <string>
#include "LuaBridge.h"
extern "C" {
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
}
using namespace luabridge;
class LuaParser
{
public:
LuaParser();
virtual ~LuaParser();
void luaParse(lua_State* L); // in this function, run (pcall) the script and retrieve functions
void run();
void stop();
private:
LuaRef mRun;
LuaRef mStop;
};
And at last, luaParser.cpp is like this:
#ifdef _WIN32
#pragma warning(disable: 4786)
#endif
#include <stdlib.h>
#include <assert.h>
#include "LuaParser.h"
#include <iostream>
#include <string>
LuaParser::LuaParser(){}
LuaParser::~LuaParser(){}
void LuaParser::luaParse(lua_State* L)
{
using namespace luabridge;
LuaRef serviceName = getGlobal(L, "service_name");
std::string LuaServiceName = serviceName.cast<std::string>();
std::cout << LuaServiceName << std::endl;
// now Let's read the function
mRun = getGlobal(L, "run");
mStop = getGlobal(L, "stop");
}
void LuaParser::run()
{
mRun();
}
void LuaParser::stop()
{
mStop();
}
When compiling the project, I get the error
error c2512: 'luabridge::LuaRef':no appropriate default constructor available
I have tried to solve this problem by such as initializing list but it doesn't work. Any idea how to solve this problem?