==========================================
POST /session/1FEE2949-B25E-48CB-B24E-358E126917F4/element HTTP/1.1
Accept: application/json
Accept-Encoding: identity
Content-Length: 90
Content-Type: application/json;charset=UTF-8
Host: 127.0.0.1:4723
User-Agent: selenium/3.141.0 (python windows)

{"using": "xpath", "value": "//Edit", "sessionId": "1FEE2949-B25E-48CB-B24E-358E126917F4"}
HTTP/1.1 200 OK
Content-Length: 96
Content-Type: application/json

{"sessionId":"1FEE2949-B25E-48CB-B24E-358E126917F4","status":0,"value":{"ELEMENT":"42.4329744"}}

info: Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker[3]
      Route matched with {action = "FindElement", controller = "FindElements"}. Executing controller action with signature System.Threading.Tasks.Task`1[Microsoft.AspNetCore.Mvc.ActionResult] FindElement(System.String, FlaUI.WebDriver.Models.FindElementRequest) on controller FlaUI.WebDriver.Controllers.FindElementsController (FlaUI.WebDriver).
fail: FlaUI.WebDriver.WebDriverResponseExceptionFilter[0]
      Returning WebDriver error response with error code unsupported operation
      FlaUI.WebDriver.WebDriverResponseException: Selector strategy 'xpath' is not supported
         at FlaUI.WebDriver.Controllers.FindElementsController.GetCondition(ConditionFactory conditionFactory, String using, String value)
         at FlaUI.WebDriver.Controllers.FindElementsController.FindElementFrom(Func`1 startNode, FindElementRequest findElementRequest, Session session)
         at FlaUI.WebDriver.Controllers.FindElementsController.FindElement(String sessionId, FindElementRequest findElementRequest)
         at lambda_method12(Closure , Object )
         at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionResultValueTask)
         at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)

    private WindowsDriver _calculatorSession;
    protected static WebElement CalculatorResult;
    private string _appId = "Microsoft.WindowsCalculator_8wekyb3d8bbwe!App";

    [OneTimeSetUp]
    public void BeforeAll()
    {
        var appCapabilities = new AppiumOptions();
        appCapabilities.AutomationName = "Windows";
        appCapabilities.App = _appId;
        appCapabilities.DeviceName = "WindowsPC";
        appCapabilities.PlatformName = "Windows";

        var serverUri = Env.ServerIsRemote() ? AppiumServers.RemoteServerUri : AppiumServers.LocalServiceUri;
        _calculatorSession = new WindowsDriver(serverUri, appCapabilities,
            Env.InitTimeoutSec);
        _calculatorSession.Manage().Timeouts().ImplicitWait = Env.ImplicitTimeoutSec;

        _calculatorSession.FindElement(MobileBy.Name("Clear")).Click();
        _calculatorSession.FindElement(MobileBy.Name("Seven")).Click();
        CalculatorResult = _calculatorSession.FindElement(MobileBy.Name("Display is 7"));
        Assert.That(CalculatorResult, Is.Not.Null);
    }

OpenQA.Selenium.WebDriverException : The actions command returned an unexpected error. System.ArgumentException: An item with the same key has already been added. Key: default keyboard
   at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
   at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
   at FlaUI.WebDriver.InputState.AddInputSource(String inputId, InputSource inputSource) in D:\projects\FlaUI\FlaUI.WebDriver\src\FlaUI.WebDriver\InputState.cs:line 98
   at FlaUI.WebDriver.Controllers.ActionsController.ExtractActionSequence(Session session, ActionsRequest actionsRequest) in D:\projects\FlaUI\FlaUI.WebDriver\src\FlaUI.WebDriver\Controllers\ActionsController.cs:line 79
   at FlaUI.WebDriver.Controllers.ActionsController.PerformActions(String sessionId, ActionsRequest actionsRequest) in D:\projects\FlaUI\FlaUI.WebDriver\src\FlaUI.WebDriver\Controllers\ActionsController.cs:line 28
   at lambda_method69(Closure , Object )
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionResultValueTask)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|20_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext)
   at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

System.Runtime.InteropServices.COMException
  HResult=0x80004005
  Message=Error HRESULT E_FAIL has been returned from a call to a COM component.
  Source=<Cannot evaluate the exception source>
  StackTrace:
 	FlaUI.UIA3.dll!FlaUI.UIA3.UIA3Automation.Compare(FlaUI.Core.AutomationElements.AutomationElement element1, FlaUI.Core.AutomationElements.AutomationElement element2)	Unknown
 	FlaUI.Core.dll!FlaUI.Core.AutomationElements.AutomationElement.Equals(FlaUI.Core.AutomationElements.AutomationElement other)	Unknown
>	FlaUI.WebDriver.dll!FlaUI.WebDriver.Session.GetOrAddKnownElement.AnonymousMethod__0(FlaUI.WebDriver.KnownElement knownElement) Line 80	C#
 	System.Linq.dll!System.Linq.Enumerable.TryGetFirst<FlaUI.WebDriver.KnownElement>(System.Collections.Generic.IEnumerable<FlaUI.WebDriver.KnownElement> source, System.Func<FlaUI.WebDriver.KnownElement, bool> predicate, out bool found)	Unknown
 	System.Linq.dll!System.Linq.Enumerable.FirstOrDefault<FlaUI.WebDriver.KnownElement>(System.Collections.Generic.IEnumerable<FlaUI.WebDriver.KnownElement> source, System.Func<FlaUI.WebDriver.KnownElement, bool> predicate)	Unknown
 	FlaUI.WebDriver.dll!FlaUI.WebDriver.Session.GetOrAddKnownElement(FlaUI.Core.AutomationElements.AutomationElement element) Line 80	C#
 	System.Linq.dll!System.Linq.Utilities.CombineSelectors.AnonymousMethod__0(System.__Canon x)	Unknown
 	System.Linq.dll!System.Linq.Enumerable.SelectArrayIterator<FlaUI.Core.AutomationElements.AutomationElement, FlaUI.WebDriver.Models.FindElementResponse>.ToArray()	Unknown
 	System.Linq.dll!System.Linq.Enumerable.ToArray<FlaUI.WebDriver.Models.FindElementResponse>(System.Collections.Generic.IEnumerable<FlaUI.WebDriver.Models.FindElementResponse> source)	Unknown
 	FlaUI.WebDriver.dll!FlaUI.WebDriver.Controllers.FindElementsController.FindElementsFrom(System.Func<FlaUI.Core.AutomationElements.AutomationElement> startNode, FlaUI.WebDriver.Models.FindElementRequest findElementRequest, FlaUI.WebDriver.Session session) Line 92	C#
 	FlaUI.WebDriver.dll!FlaUI.WebDriver.Controllers.FindElementsController.FindElements(string sessionId, FlaUI.WebDriver.Models.FindElementRequest findElementRequest) Line 42	C#

System.InvalidOperationException
  HResult=0x80131509
  Message=Collection was modified; enumeration operation may not execute.
  Source=System.Private.CoreLib
  StackTrace:
   at System.ThrowHelper.ThrowInvalidOperationException_InvalidOperation_EnumFailedVersion()
   at System.Collections.Generic.Dictionary`2.Enumerator.MoveNext()
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.ToArray()
   at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
   at FlaUI.WebDriver.Session.EvictUnavailableElements() in D:\projects\FlaUI\FlaUI.WebDriver\src\FlaUI.WebDriver\Session.cs:line 133
   at FlaUI.WebDriver.SessionCleanupService.EvictUnavailableElements(ISessionRepository sessionRepository) in D:\projects\FlaUI\FlaUI.WebDriver\src\FlaUI.WebDriver\SessionCleanupService.cs:line 47
   at FlaUI.WebDriver.SessionCleanupService.DoWork(Object state) in D:\projects\FlaUI\FlaUI.WebDriver\src\FlaUI.WebDriver\SessionCleanupService.cs:line 39
   at System.Threading.TimerQueueTimer.<>c.<.cctor>b__27_0(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)

var processStartInfo = new ProcessStartInfo("initialstart.application");
processStartInfo.UseShellExecute = true; 

using (Application.Launch(processStartInfo))
{
   Thread.Sleep(10000);	//wait for actual application to start
   using (var app = Application.Attach("actualapplication.exe"))
     {

processStartInfo.UseShellExecute = true;        //new line added here
app = Core.Application.Launch(processStartInfo);

System.InvalidOperationException : Required capabilities did not match. Capability `platformName` with value `windows` is required, capability 'appium:automationName' with value `FlaUI` is required, and one of appium:app, appium:appTopLevelWindow or appium:appTopLevelWindowTitleMatch must be passed as a capability (SessionNotCreated)

                    AppiumOptions desktopCapabilities = new AppiumOptions();
                    desktopCapabilities.App = "Root";
                    desktopCapabilities.DeviceName = "WindowsPC";
                    desktopCapabilities.AutomationName = "FlaUI";
                    var desktopSession = new WindowsDriver(serverUri, desktopCapabilities);