correct tool name in load_tools

app.py

@@ -85,7 +85,7 @@ llm = chat
 
 # tools = [DB_Search(), duckduckgo_tool, python_tool]
 
-tools = load_tools(["DB_Search","duckduckgo_tool","python_tool","llm-math"], llm=llm)
+tools = load_tools(["Vector Database Search","Wikipedia Search","Python REPL","llm-math"], llm=llm)
 
 embeddings = OpenAIEmbeddings(deployment="model_embedding", chunk_size=15)