node: symbol lookup error: , undefined symbol: _ZN4demo3sumEii

I am creating a C++ addon and I wanted to use a static library. i have a .a library libarith which does simple addition.

-libarith.a
-hello.cc
-hello.js

my binding.gyp file is as follows:-

{ "targets": [
        {
        "target_name": "addon",
        "sources": [ "hello.cc" ],
        "libraries": [ "-/home/folder/api/addon/libarith.a" ],
        "cflags!": [ "-fno-exceptions" ],
        "cflags": [ "-std=c++11" ],
        "cflags_cc!": [ "-fno-exceptions" ]
        }
        ]
    }

When i compile my hello.cc it compiles well. But when i run my addon , it gives following error:

node: symbol lookup error: /home/folder/api/addon/build/Release/addon.node: undefined symbol: _ZN4demo3sumEii.

I am new to addons, a help would be very much appreciated.

Code Snippet:- libarith.a contains:

int sum(int a ,int b){

    return a+b;
} 

// hello.cc

#include <node.h>
#include <vector>
#include <iostream>
#include <v8.h>
using namespace std;
using namespace v8;
namespace demo {

using v8::FunctionCallbackInfo;
using v8::Isolate;
using v8::Local;
using v8::Object;
using v8::String;
using v8::Value;
void newmethod(const FunctionCallbackInfo<Value>& args)
{ extern int sum(int,int);

Isolate* isolate = args.GetIsolate();
double abc= sum(4,5);
Local<Number> newnumber =Number::New(isolate,abc);
v8::String::Utf8Value r(args[1]);
    std::string rst(*r);
Local<String> first = String::NewFromUtf8(isolate, "firstargument");
Local<String> second = String::NewFromUtf8(isolate, "secondargument");
Local<Object> newobj= Object::New(isolate);
newobj->Set(first,String::NewFromUtf8(isolate, *s));
newobj->Set(second,newnumber);
args.GetReturnValue().Set(newobj);

}
void init(Local<Object> exports) {
  NODE_SET_METHOD(exports, "newmethod", newmethod);
}
NODE_MODULE(addon, init)
} 

//hello.js

const addon = require('./build/Release/addon');

var ss = "helloo";
var samplestring = "It is not a sample string";
console.log(addon.newmethod(samplestring, ss));

EDIT:- The solution worked as follows. I tried to create a separate directory for the libraries and it worked fine.

It says, it cannot find the declaration(implementation of .h). I think you give wrong direction to your library. There are two solutions:

1. Write full directory to your library at binding.gyp ~/whereItIsLocated, in my case it was ~/CLionProjects/node-player-core/PlayerCore/lib/x64/yourLibraryName.a
2. If previous solution couldn't help, you can copy you library to /usr/lib. You can do it with sudo cp ~/whereLibraryLocated /usr/lib.