diff --git a/gui/OpenFaceOffline/MainWindow.xaml.cs b/gui/OpenFaceOffline/MainWindow.xaml.cs
index ad0e7220..612a8160 100644
--- a/gui/OpenFaceOffline/MainWindow.xaml.cs
+++ b/gui/OpenFaceOffline/MainWindow.xaml.cs
@@ -208,6 +208,14 @@ namespace OpenFaceOffline
             // Reload the face landmark detector if needed
             ReloadLandmarkDetector();
 
+            if(!landmark_detector.isLoaded())
+            {
+                DetectorNotFoundWarning();
+                EndMode();
+                thread_running = false;
+                return;
+            }
+
             // Set the face detector
             face_model_params.SetFaceDetector(DetectorHaar, DetectorHOG, DetectorCNN);
             face_model_params.optimiseForVideo();
@@ -302,10 +310,18 @@ namespace OpenFaceOffline
 
             // Reload the face landmark detector if needed
             ReloadLandmarkDetector();
+
+            if (!landmark_detector.isLoaded())
+            {
+                DetectorNotFoundWarning();
+                EndMode();
+                thread_running = false;
+                return;
+            }
+
             // Setup the parameters optimized for working on individual images rather than sequences
             face_model_params.optimiseForImages();
 
-
             // Setup the visualization
             Visualizer visualizer_of = new Visualizer(ShowTrackedVideo || RecordTracked, ShowAppearance, ShowAppearance, false);
 
@@ -425,7 +441,17 @@ namespace OpenFaceOffline
             }
         }
 
+        private void DetectorNotFoundWarning()
+        {
+            string messageBoxText = "Could not open the landmark detector model file. For instructions of how to download them, see https://github.com/TadasBaltrusaitis/OpenFace/wiki/Model-download";
+            string caption = "Model file not found or corrupt";
+            MessageBoxButton button = MessageBoxButton.OK;
+            MessageBoxImage icon = MessageBoxImage.Warning;
 
+            // Display message box
+            System.Windows.MessageBox.Show(messageBoxText, caption, button, icon);
+
+        }
 
         private void RecordObservation(RecorderOpenFace recorder, RawImage vis_image, int face_id, bool success, float fx, float fy, float cx, float cy, double timestamp, int frame_number)
         {
diff --git a/lib/local/CppInerop/LandmarkDetectorInterop.h b/lib/local/CppInerop/LandmarkDetectorInterop.h
index af0a58a3..b1ba4019 100644
--- a/lib/local/CppInerop/LandmarkDetectorInterop.h
+++ b/lib/local/CppInerop/LandmarkDetectorInterop.h
@@ -152,17 +152,17 @@ namespace CppInterop {
 
 			bool IsCECLM()
 			{
-				return params->curr_face_detector == ::LandmarkDetector::FaceModelParameters::CECLM_DETECTOR;
+				return params->curr_landmark_detector == ::LandmarkDetector::FaceModelParameters::CECLM_DETECTOR;
 			}
 
 			bool IsCLNF()
 			{
-				return params->curr_face_detector == ::LandmarkDetector::FaceModelParameters::CLNF_DETECTOR;
+				return params->curr_landmark_detector == ::LandmarkDetector::FaceModelParameters::CLNF_DETECTOR;
 			}
 
 			bool IsCLM()
 			{
-				return params->curr_face_detector == ::LandmarkDetector::FaceModelParameters::CLM_DETECTOR;
+				return params->curr_landmark_detector == ::LandmarkDetector::FaceModelParameters::CLM_DETECTOR;
 			}
 
 			System::String^ GetMTCNNLocation()
@@ -259,6 +259,11 @@ namespace CppInterop {
 				this->!CLNF();
 			}
 
+			bool isLoaded()
+			{
+				return clnf->loaded_successfully;
+			}
+
 
 			::LandmarkDetector::CLNF* getCLNF() {
 				return clnf;