What is error in automated

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C#

testing

am trying unit testing on this code. But this program throw unhandled exception.

//Create reference for out browser
          IWebDriver driver = new ChromeDriver();
          //Navigate to our page
          driver.Navigate().GoToUrl("http://www.google.com");
          //Find an element
          IWebElement element = driver.FindElement(By.Name("q"));
          //Profrom Ops
          element.SendKeys("executeautomation");
          Console.Read();

What I have tried:

what is expectation please give me solution