Hello Ashish sir, I am using Mac os , i tried all the possibilities i still keep getting this error

Exception in thread "main" java.lang.IllegalStateException: The driver executable does not exist: /Users/Aks/Downlods/Day2/geckodriver

at com.google.common.base.Preconditions.checkState(Preconditions.java:585)

at org.openqa.selenium.remote.service.DriverService.checkExecutable(DriverService.java:146)

at org.openqa.selenium.remote.service.DriverService.findExecutable(DriverService.java:141)

at org.openqa.selenium.firefox.GeckoDriverService.access$100(GeckoDriverService.java:44)

at org.openqa.selenium.firefox.GeckoDriverService$Builder.findDefaultExecutable(GeckoDriverService.java:167)

at org.openqa.selenium.remote.service.DriverService$Builder.build(DriverService.java:355)

at org.openqa.selenium.firefox.FirefoxDriver.toExecutor(FirefoxDriver.java:190)

at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:147)

at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:125)

at SeleniumDrivers.main(SeleniumDrivers.java:10)

------- My code is 

import org.openqa.selenium.WebDriver;

import org.openqa.selenium.firefox.FirefoxDriver;

public class SeleniumDrivers {

public static void main(String[] args) {

// TODO Auto-generated method stub

    System.setProperty("webdriver.gecko.driver","/Users/Aks/Downlods/Day2/geckodriver");

    FirefoxDriver fd1 = new FirefoxDriver();

    fd1.get("https://www.yahoo.com");

}

}