Update app.py

app.py

@@ -109,7 +109,7 @@ class Reviewer:
         
 
     def extract_chapter(self, pdf_path):
-        if isinstance(pdf_path, gr.utils NamedString):
+        if isinstance(pdf_path, gradio.utils NamedString):
             pdf_path = BytesIO(pdf_path.name)  # 将NamedString对象转换为BytesIO对象
         file_object = BytesIO(pdf_path)
         pdf_reader = PyPDF2.PdfReader(file_object)