Update webgui.py

webgui.py

@@ -202,6 +202,7 @@ def process_video(uploaded_img, uploaded_audio, width, height, length, seed, fac
         face_mask[:, :] = 255
         face_img = cv2.resize(face_img, (width, height))
         face_mask = cv2.resize(face_mask, (width, height))
+        raise gr.Error("Face Detector could not detect a face in your image. Try with a 512 squared image where the face is clearly visible.")
     else:
         print("SELECT_BBOX IS NOT NONE")
         xyxy = select_bbox[:4]