When launching Ideagen Internal Audit (Aura), the following error message appears:

EXCEPTION: InvalidOperationException

message:   The calling thread must be STA, because many UI components require this.
source:    PresentationCore
target:    Void .ctor()
stack:        at System.Windows.Input.InputManager..ctor()
   at System.Windows.Input.InputManager.GetCurrentInputManagerImpl()
   at System.Windows.Input.KeyboardNavigation..ctor()
   at System.Windows.FrameworkElement.FrameworkServices..ctor()
   at System.Windows.FrameworkElement.EnsureFrameworkServices()
   at System.Windows.FrameworkElement..ctor()
   at System.Windows.Controls.Control..ctor()
   at System.Windows.Window..ctor()
   at Pentana.Tng.UI.Smart.ExceptionWindow..ctor(Exception exception)
   at Pentana.Tng.UI.Smart.Application.CheckLicenseWorker_DoWork(Object sender, DoWorkEventArgs e)
   at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
   at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)

The error arises because a previous run of Pentana did not exit cleanly.

Reboot the PC.