Update app/internal_loads.py

app/internal_loads.py

@@ -210,7 +210,7 @@ def display_internal_loads_page():
     st.write("Define internal heat gains from people, lighting, equipment, ventilation, and infiltration based on ASHRAE 2005 Handbook.")
     
     # Check if building type is set
-    building_type = st.session_state.building_info.get("building_type")
+    building_type = st.session_state.project_data.building_info.get("building_type")
     if not building_type:
         st.error("Please select a building type in Building Information.")
         if st.button("Go to Building Information", key="internal_to_building"):