Update app.py

app.py

@@ -38,8 +38,8 @@ embeddings = HuggingFaceInstructEmbeddings(model_name=embed_model)
 # embeddings = MistralAIEmbeddings()
 
 def initialize(arxivcode):  
-    docs = retriever.invoke(arxivcode) 
-    docs[0].metadata['Published'] = str(doc[0].metadata['Published'])
+    docs = retriever.invoke(str(arxivcode))
+    docs[0].metadata['Published'] = str(docs[0].metadata['Published'])
 
     def format_docs(docs):
         return "\n\n".join(doc.page_content for doc in docs)