Update app.py

app.py

@@ -26,7 +26,7 @@ def preload_indexes():
         print("❌ Failed to load insurance.pdf")
 
     try:
-        state["paul_engine"] = build_index_from_file("data/paulgraham.txt")
+        state["paul_engine"] = build_index_from_file("data/paul_graham.txt")
     except:
         print("❌ Failed to load paulgraham.txt")