crash

Exception in Gtk# callback delegate
  Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ArgumentNullException: Value cannot be null.
Parameter name: path
  at System.IO.Directory.GetParent (System.String path) [0x00003] in <c55c101c67364519984d16dfbf520884>:0
  at TerraTechModManagerGTK.Patcher.RunExe (System.String args) [0x00096] in <89a86489bd9b4941acba238df5200353>:0
  at MainWindow.UserInstallPatch (System.Object sender, System.EventArgs e) [0x00007] in <89a86489bd9b4941acba238df5200353>:0
  at (wrapper managed-to-native) System.Reflection.RuntimeMethodInfo.InternalInvoke(System.Reflection.RuntimeMethodInfo,object,object[],System.Exception&)
  at System.Reflection.RuntimeMethodInfo.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x0006a] in <c55c101c67364519984d16dfbf520884>:0
   --- End of inner exception stack trace ---
  at System.Reflection.RuntimeMethodInfo.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00083] in <c55c101c67364519984d16dfbf520884>:0
  at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in <c55c101c67364519984d16dfbf520884>:0
  at System.Delegate.DynamicInvokeImpl (System.Object[] args) [0x000e7] in <c55c101c67364519984d16dfbf520884>:0
  at System.MulticastDelegate.DynamicInvokeImpl (System.Object[] args) [0x00008] in <c55c101c67364519984d16dfbf520884>:0
  at System.Delegate.DynamicInvoke (System.Object[] args) [0x00000] in <c55c101c67364519984d16dfbf520884>:0
  at GLib.Signal.ClosureInvokedCB (System.Object o, GLib.ClosureInvokedArgs args) [0x0007e] in <bbc097c736e649f0bbe49b81946fd886>:0
  at GLib.Signal+SignalClosure.Invoke (GLib.ClosureInvokedArgs args) [0x00011] in <bbc097c736e649f0bbe49b81946fd886>:0
  at GLib.Signal+SignalClosure.MarshalCallback (System.IntPtr raw_closure, GLib.Value* return_val, System.UInt32 n_param_vals, GLib.Value* param_values, System.IntPtr invocation_hint, System.IntPtr marshal_data) [0x00053] in <bbc097c736e649f0bbe49b81946fd886>:0
  at GLib.ExceptionManager.RaiseUnhandledException (System.Exception e, System.Boolean is_terminal) [0x00000] in <bbc097c736e649f0bbe49b81946fd886>:0
  at GLib.Signal+SignalClosure.MarshalCallback (System.IntPtr raw_closure, GLib.Value* return_val, System.UInt32 n_param_vals, GLib.Value* param_values, System.IntPtr invocation_hint, System.IntPtr marshal_data) [0x00000] in <bbc097c736e649f0bbe49b81946fd886>:0
  at Gtk.Application.gtk_main_iteration () [0x00000] in <40f46e55eb67454ab904dc9e5644a3a1>:0
  at Gtk.Application.RunIteration () [0x00000] in <40f46e55eb67454ab904dc9e5644a3a1>:0
  at TerraTechModManagerGTK.MainClass.Main (System.String[] args) [0x00000] in <89a86489bd9b4941acba238df5200353>:0