fixed runtime error

app.py

@@ -19,7 +19,7 @@ from langchain.chains import ConversationalRetrievalChain
 def loading_pdf():
     return "Loading..."
 
-def pdf_changes("https://drive.google.com/file/d/1rXzpCHuwofyvTPDwciSn_x4J2b3-q-HB/view?usp=share_link", open_ai_key):
+def pdf_changes(pdf_doc, open_ai_key):
     if openai_key is not None:
         os.environ['OPENAI_API_KEY'] = open_ai_key
         loader = OnlinePDFLoader(pdf_doc.name)