Update app.py

app.py

@@ -96,7 +96,7 @@ def identify_headers_with_openrouter(pdf_path, model,LLM_prompt, pages_to_check=
     if api_key is None:
        
         api_key = os.getenv("OPENROUTER_API_KEY") or None
-
+    model=str(model)
     toc_pages = get_toc_page_numbers(doc)
     lines_for_prompt = []