Add error handling in build_interface

app.py

@@ -242,11 +242,15 @@ def format_instruction_html(text: str) -> str:
 
 def build_interface():
     """Build Gradio interface."""
-    metadata, end_effector, hands_2d = load_data()
+    try:
+        metadata, end_effector, hands_2d = load_data()
+    except Exception as e:
+        print(f"Error loading data: {e}")
+        metadata, end_effector, hands_2d = {}, {}, {}
     
     total_frames = len(metadata.get('poses', []))
     fps = metadata.get('fps', 60)
-    hand_detection_rate = len(hands_2d) / max(1, total_frames) * 100
+    hand_detection_rate = len(hands_2d) / max(1, total_frames) * 100 if total_frames > 0 else 0
     
     left_poses = sum(1 for f in end_effector.values() if f and isinstance(f, dict) and f.get('left_hand'))
     right_poses = sum(1 for f in end_effector.values() if f and isinstance(f, dict) and f.get('right_hand'))
@@ -254,12 +258,20 @@ def build_interface():
     video_path = DATA_DIR / "video.mp4"
     
     # Build data for left hand
-    left_timestamps, left_state = build_state_dataframe(metadata, end_effector, "left")
-    left_figs = {metric: build_plot_html(left_timestamps, left_state, metric) for metric in METRIC_LABELS.keys()}
+    try:
+        left_timestamps, left_state = build_state_dataframe(metadata, end_effector, "left")
+        left_figs = {metric: build_plot_html(left_timestamps, left_state, metric) for metric in METRIC_LABELS.keys()}
+    except Exception as e:
+        print(f"Error building left hand plots: {e}")
+        left_figs = {metric: "<p>Plot unavailable</p>" for metric in METRIC_LABELS.keys()}
     
     # Build data for right hand
-    right_timestamps, right_state = build_state_dataframe(metadata, end_effector, "right")
-    right_figs = {metric: build_plot_html(right_timestamps, right_state, metric) for metric in METRIC_LABELS.keys()}
+    try:
+        right_timestamps, right_state = build_state_dataframe(metadata, end_effector, "right")
+        right_figs = {metric: build_plot_html(right_timestamps, right_state, metric) for metric in METRIC_LABELS.keys()}
+    except Exception as e:
+        print(f"Error building right hand plots: {e}")
+        right_figs = {metric: "<p>Plot unavailable</p>" for metric in METRIC_LABELS.keys()}
     
     stats_html = f"""
 <div class="stats-card">