Delete DuckDuckGoSearchTool bucause of library name changed for pip.

app.py

@@ -36,7 +36,7 @@ def get_current_time_in_timezone(timezone: str) -> str:
 
 final_answer = FinalAnswerTool()
 # Add tools by hiroshi
-web_search = DuckDuckGoSearchTool()
+# web_search = DuckDuckGoSearchTool()
 visit_webpage = VisitWebpageTool()
 
 
@@ -60,7 +60,8 @@ with open("prompts.yaml", 'r') as stream:
 agent = CodeAgent(
     model=model,
 #    tools=[final_answer], ## add your tools here (don't remove final answer)
-    tools=[final_answer,get_current_time_in_timezone,web_search,visit_webpage], ## add your tools here (don't remove final answer)
+#    tools=[final_answer,get_current_time_in_timezone,web_search,visit_webpage], ## add your tools here (don't remove final answer)
+    tools=[final_answer,get_current_time_in_timezone,visit_webpage], ## add your tools here (don't remove final answer)
     max_steps=6,
     verbosity_level=1,
     grammar=None,