Issue in loading npm modules

[maninderjeet]

Following is my test.js file

load('scripts/jvm-npm.js');
var webdriverio = require('webdriverio');
var options = {
    desiredCapabilities: {
        browserName: 'chrome'
    }
};
function launchbrowser(){
	var client=webdriverio.remote(options).init();
	client.url('https://www.github.com');
	client.end();
}

But when I'm launching it through Java Nashorn its not able to find some modules. But if we go to node_modules folder everything is there.
Code for Nashorn:

public static void launchWebDriverIO() throws ScriptException, NoSuchMethodException,
			IOException {
		System.out.println("Launching WebDriver IO");
		String testjsFile = System.getProperty("user.dir") + File.separator + "scripts"
				+ File.separator + "test.js";
		ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
		engine.eval(new FileReader(testjsFile));
		Invocable invocable = (Invocable) engine;
		invocable.invokeFunction("launchbrowser");
	}

Error:

Cannot load module ../modules/es6.object.to-string LOAD_ERROR
Cannot load module core-js/library/fn/promise LOAD_ERROR
javax.script.ScriptException: Error: Cannot read file 
Cannot load module babel-runtime/core-js/promise LOAD_ERROR
Cannot load module ./lib/webdriverio LOAD_ERROR
Cannot load module webdriverio LOAD_ERROR