Update app.py

app.py

@@ -428,7 +428,7 @@ def get_pdf_list():
             links.append(f"• [📄 {os.path.basename(pdf)}]({url})")
         
         return f"**📚 Uploaded PDFs ({len(pdf_files)}):**\n" + "\n".join(links)
-    except Exception ee:
+    except Exception as ee:
         print (ee)
         return f"**❌ Cannot load PDF list**error: {ee}"