unable cast string to object

DesiredCapabilities capabilities = DesiredCapabilities.Chrome();
ChromeOptions options = new ChromeOptions();
options.AddArguments("test-type");
options.BinaryLocation = @"C:Usersebrahimpour.lDocumentsVisual Studio 2015ProjectsFirstPackageFirstPackagebinDebug  chromedriver.exe";
capabilities.SetCapability("chrome.binary", @"C:Usersebrahimpour.lDocumentsVisual Studio 2015ProjectsFirstPackageFirstPackagebinDebug  chromedriver.exe");
capabilities.SetCapability(ChromeOptions.Capabilit  y, options);
System.Environment.SetEnvironmentVariable("webdriv  er.chrome.driver",
@"C:Usersebrahimpour.lDocumentsVisual Studio 2015ProjectsFirstPackageFirstPackagebinDebug  chromedriver.exe");
driver = new ChromeDriver(@"C:Usersebrahimpour.lDocumentsVi  sual Studio 2015ProjectsFirstPackageFirstPackagebinDebug"  );
capabilities.SetCapability(capabilities.Platform.P  rotocolPlatformType, "WebDriver");
capabilities.SetCapability(CapabilityType.BrowserN  ame, "chrome");
capabilities.SetCapability(capabilities.Version, "57");
capabilities.SetCapability(CapabilityType.Platform  , "WinNT");
capabilities.SetCapability(ChromeOptions.Capabilit  y, options);
RemoteWebDriver rw = new RemoteWebDriver(new Uri("http://localhost:4444/grid/console"), capabilities);
driver = rw;
baseURL = "http://192.168.10.173:8080/";
verificationErrors = new StringBuilder();

error: