.net - WinAppDriver cannot connect to wpf application -

while creating webdriver session wpf application session times out. however, wpf application launched. using nunit under windows 10. exception occurs while trying instantiate iosdriver object. sample notepad works fine https://github.com/microsoft/winappdriver/tree/master/samples/c%23/notepadtest. however, when trying same wpf app, times out.

functiontests.tests.report.loadparthistorytest.openparthistory: setup : openqa.selenium.webdriverexception : http request remote webdriver server url http://127.0.0.1:4723/session timed out after 60 seconds. ----> system.net.webexception : operation has timed out teardown : system.nullreferenceexception : object reference not set instance of object.

at openqa.selenium.appium.service.appiumcommandexecutor.execute(command commandtoexecute) @ openqa.selenium.remote.remotewebdriver.execute(string drivercommandtoexecute, dictionary2 parameters) @ openqa.selenium.remote.remotewebdriver.startsession(icapabilities desiredcapabilities) @ openqa.selenium.remote.remotewebdriver..ctor(icommandexecutor commandexecutor, icapabilities desiredcapabilities) @ openqa.selenium.appium.appiumdriver1..ctor(uri remoteaddress, icapabilities desiredcapabilities) @ openqa.selenium.appium.ios.iosdriver`1..ctor(uri remoteaddress, desiredcapabilities desiredcapabilities)

protected const string appdriverurl = "http://127.0.0.1:4723/";          protected const string appid = @"<exelocation>";          protected static iosdriver<ioselement> studiosession;          [setup]         public void setup()         {             // launch notepad classic windows application             desiredcapabilities appcapabilities = new desiredcapabilities();             appcapabilities.setcapability("app", appid);             studiosession = new iosdriver<ioselement>(new uri(appdriverurl), appcapabilities);             assert.isnotnull(studiosession);         }