title: Unhandled exception. OpenQA.Selenium.WebDriverException: The new session command returned a value ('Unknown error') that is not a valid JSON object
body: <h3>Problem</h3>
  <p>When I try to run the application in the integrated development environment (<strong>Jetbrains Rider</strong>) an error occurs:</p>
  <pre><code>[15:14:06.969] - Listening on http://127.0.0.1:43237/ [15:14:06.969] - Listening on http://[::1]:43237/ Unhandled exception. OpenQA.Selenium.WebDriverException: The new session command returned a value ('Unknown error') that is not a valid JSON object.
  </code></pre>
  <hr />
  <h3>Source Code</h3>
  <pre><code>    IWebDriver  driver = new EdgeDriver();
      driver.Navigate().GoToUrl(&quot;https://www.instagram.com&quot;);
  
      IWebElement usernameInput = driver.FindElement(By.CssSelector(&quot;input[name='username']&quot;));
      IWebElement passwordInput = driver.FindElement(By.CssSelector(&quot;input[name='password']&quot;));
  
  
      usernameInput.SendKeys(&quot;YourUsername&quot;);
      passwordInput.SendKeys(&quot;YourPassword&quot;);
  </code></pre>
  <hr />
  <h3>Properties of the NuGet Packages used</h3>
  <p><code>Selenium.WebDriver.MSEdgeDriver</code> - Version <code>87.0.669</code></p>
  <p><code>Selenium.WebDriver</code> - Version <code>4.0.0-alpha07</code></p>