selenium WebDriverError: connection refused nodejs - node.js

Question

node version: v8.5.0
npm version: 5.3.0
geckodriver: v0.19.0
"selenium-webdriver": "^3.5.0"
I'm trying to test selenium webdriver in nodejs, however I keep getting the following error:
/home/app_path/node_modules/selenium-webdriver/lib/promise.js:2634
throw error;
^
WebDriverError: connection refused
at Object.throwDecodedError (/home/app_path/node_modules/selenium-webdriver/lib/error.js:497:15)
at parseHttpResponse (/home/app_path/node_modules/selenium-webdriver/lib/http.js:519:13)
at doSend.then.response (/home/app_path/node_modules/selenium-webdriver/lib/http.js:441:30)
at <anonymous>
at process._tickDomainCallback (internal/process/next_tick.js:228:7)
From: Task: WebDriver.createSession()
at Function.createSession (/home/app_path/node_modules/selenium-webdriver/lib/webdriver.js:769:24)
at Function.createSession (/home/app_path/node_modules/selenium-webdriver/firefox/index.js:572:41)
at createDriver (/home/app_path/node_modules/selenium-webdriver/index.js:170:33)
at Builder.build (/home/app_path/node_modules/selenium-webdriver/index.js:645:16)
at Object.<anonymous> (/home/app_path/app.js:20:2)
at Module._compile (module.js:624:30)
at Object.Module._extensions..js (module.js:635:10)
at Module.load (module.js:545:32)
at tryModuleLoad (module.js:508:12)
at Function.Module._load (module.js:500:3)
at Function.Module.runMain (module.js:665:10)
at startup (bootstrap_node.js:201:16)
at bootstrap_node.js:626:3
A Mozilla firefox window just opens, and after some time, this error appears in console. This is what I'm trying to do:
var webdriver = require('selenium-webdriver'),
By = webdriver.By,
until = webdriver.until;
var driver = new webdriver.Builder()
.forBrowser('firefox')
.build().then(function(){
console.log("log");
driver.get("https://google.co.in");
});
how to fix this?
EDIT Here's the stacktrace
{"value":{"error":"unknown error","message":"connection refused","stacktrace":"stack backtrace:\n 0: 0x4f388c - backtrace::backtrace::trace::h736111741fa0878e\n 1: 0x4f38c2 - backtrace::capture::Backtrace::new::h63b8a5c0787510c9\n 2: 0x442d88 - webdriver::error::WebDriverError::new::hea6d4dbf778b2b24\n 3: 0x449f99 - geckodriver::marionette::MarionetteHandler::create_connection::hf8b6061dba65cdd0\n 4: 0x42ac91 - >::run::hba9181b5aacf8f04\n 5: 0x402c59 - std::sys_common::backtrace::__rust_begin_short_backtrace::h19de262639927233\n 6: 0x40c065 - std::panicking::try::do_call::h6c1659fc4d01af51\n 7: 0x5e38ec - panic_unwind::__rust_maybe_catch_panic\n at /checkout/src/libpanic_unwind/lib.rs:98\n 8: 0x420d32 - >::call_box::h953e5f59694972c5\n 9: 0x5dc00b - alloc::boxed::{{impl}}::call_once<(),()>\n at /checkout/src/liballoc/boxed.rs:661\n - std::sys_common::thread::start_thread\n at /checkout/src/libstd/sys_common/thread.rs:21\n - std::sys::imp::thread::{{impl}}::new::thread_start\n at /checkout/src/libstd/sys/unix/thread.rs:84"}}