SourceTree cannot start [see error log in desc]

I have SourceTree installed in my laptop since long time ago. I didn't use my laptop for 2 weeks and now SourceTree doesn't want to start. When I click on the icon, nothing happen. No error message or anything.

I have tried to uninstall and reinstall. Still the same. Can somebody help me?

This is the error log:

ERROR [2017-10-08 14:57:52,573] [1] [SourceTree.App] [.ctor] - finish EnsureSquirrelExecutionStubIsCopied
ERROR [2017-10-08 14:58:12,269] [1] [SourceTree.App] [OnStartup] - Failed to start
System.NullReferenceException: Object reference not set to an instance of an object.
   at SourceTree.Notifications.NotificationsManager.SetOwner(NotificationDialogWindow notificationWindow)
   at SourceTree.Notifications.NotificationsManager.ShowNotificationDialog[T](NotificationDialogWindow notificationWindow, Tuple`2 customAction, VistaTaskDialogIcon icon)
   at SourceTree.Notifications.NotificationsManager.ShowNotificationDialog[T](String title, String message, Tuple`2 customAction, String cancelLabel, String suppressionSetting, Action`1 suppressionChangedAction, Object contentControl, String contentCommandLabel, Action contentAction)
   at SourceTree.Notifications.NotificationsManager.ShowNotificationDialogWithYesConfirmation(String title, String message, String details)
   at SourceTree.Configuration.WpfSpellCheckerPreFlightCheck.Run()
   at SourceTree.AppRoot.RunPreFlightChecks()
   at SourceTree.AppRoot.OnStartup(StartupEventArgs e)
   at SourceTree.App.OnStartup(StartupEventArgs e)

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