error

app.py

@@ -18,12 +18,10 @@ def loading_pdf():
     return "Working on the upload. Also, pondering the usefulness of sporks..."
 
 def pdf_changes(pdf_doc):
-     try:
+    try:
         if pdf_doc is None:
             return "No PDF uploaded."
         
-        loader = OnlinePDFLoader(pdf_doc.name)
-        documents = loader.load()
         loader = OnlinePDFLoader(pdf_doc.name)
         documents = loader.load()
         text_splitter = CharacterTextSplitter(chunk_size=1000, chunk_overlap=100)
@@ -32,15 +30,17 @@ def pdf_changes(pdf_doc):
         global db
         db = Chroma.from_documents(texts, embeddings)
         retriever = db.as_retriever()
-        global qa 
+        global qa
         qa = ConversationalRetrievalChain.from_llm(
-        llm=OpenAI(temperature=0.2, model_name="gpt-3.5-turbo-16k", max_tokens=-1, n=2),  
-        retriever=retriever, 
-        return_source_documents=False)
+            llm=OpenAI(temperature=0.2, model_name="gpt-3.5-turbo", max_tokens=-1, n=2),
+            retriever=retriever,
+            return_source_documents=False
+        )
         return "Ready"
     except Exception as e:
         return f"Error loading PDF: {e}"
 
+
 def clear_data():
     global qa, db
     qa = None