anchor.diff:  /// Starts appium as local service
   let startAppium() =
       if localService = null then
  -        let builder = AppiumServiceBuilder().WithLogFile(new System.IO.FileInfo("Log"));
  +        let fi = FileInfo logFile
  +        if not fi.Directory.Exists then
  +            fi.Directory.Create()
  +
  +        let builder = AppiumServiceBuilder().WithLogFile(fi)
           localService <- builder.Build()
       if not localService.IsRunning then
           localService.Start()
  
positive.code: 
  let mutable driver : AndroidDriver<IWebElement> = null
  let mutable localService : AppiumLocalService = null
  
  //configuration
  let mutable waitTimeout = 10.0
  
negative.code: module canopy.mobile
  
  open System
  open System.IO
  open OpenQA.Selenium
  open OpenQA.Selenium.Remote
  open OpenQA.Selenium.Appium
  