Exception while executing the code in IE11

[abhi sr]

public static void main(String[] args) throws IOException 

{

System.setProperty("webdriver.ie.driver","D:\\abhi\\selenium\\IEDriverServer.exe");

WebDriver driver = new InternetExplorerDriver();

driver.manage().window().maximize();

driver.manage().timeouts().implicitlyWait(50, TimeUnit.SECONDS);

driver.manage().timeouts().pageLoadTimeout(60, TimeUnit.SECONDS);

               // handling window security pop up

Runtime.getRuntime().exec("D:\\abhi\\selenium\\topuser1_branch.exe");

              // navigating to url

driver.get("http://toppt.agilitylogistics.com/");

driver.findElement(By.linkText("Sign Out")).click();

}

for this code im getting below exception.

Listening on port 2252

Exception in thread "main" org.openqa.selenium.UnhandledAlertException: Modal dialog present: 

Build info: version: '2.45.0', revision: '5017cb8', time: '2015-02-26 23:59:50'

System info: host: 'INHYDAMANDALA', ip: '10.138.70.90', os.name: 'Windows 7', os.arch: 'x86', os.version: '6.1', java.version: '1.8.0_25'

Driver info: org.openqa.selenium.ie.InternetExplorerDriver

Capabilities [{browserAttachTimeout=0, enablePersistentHover=true, ie.forceCreateProcessApi=false, ie.usePerProcessProxy=false, ignoreZoomSetting=false, handlesAlerts=true, version=11, platform=WINDOWS, nativeEvents=true, ie.ensureCleanSession=false, elementScrollBehavior=0, ie.browserCommandLineSwitches=, requireWindowFocus=false, browserName=internet explorer, initialBrowserUrl=http://localhost:2252/, takesScreenshot=true, javascriptEnabled=true, ignoreProtectedModeSettings=false, enableElementCacheCleanup=true, cssSelectorsEnabled=true, unexpectedAlertBehaviour=dismiss}]

Session ID: 0de40ccf-e72f-4215-8baa-6a3fe965fca7

*** Element info: {Using=link text, value=Sign Out}

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)

at java.lang.reflect.Constructor.newInstance(Unknown Source)

at org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:204)

at org.openqa.selenium.remote.ErrorHandler.createUnhandledAlertException(ErrorHandler.java:185)

at org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:152)

at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:599)

at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:352)

at org.openqa.selenium.remote.RemoteWebDriver.findElementByLinkText(RemoteWebDriver.java:401)

at org.openqa.selenium.By$ByLinkText.findElement(By.java:242)

at org.openqa.selenium.remote.RemoteWebDriver.findElement(RemoteWebDriver.java:344)

at seleniumStakeholderTesting.IexplorersmdmTesting.main(IexplorersmdmTesting.java:37)

pls suggest me solution

[Alexra]

Please verify Enable Protected Mode is checked for both Internet, Local Intranet, Trusted sites and restricted sites.