Update app.py

Modified call to DuckDuckGoSearchTool

app.py

@@ -26,7 +26,7 @@ def get_web_search_results(query: str)-> str: #it's import to specify the return
         query: A string representing a valid web query. IMPORTANT: Follow type str format strictly e.g. 'pictures of cats'.
     """
     try:
-        results = DuckDuckGoSearchTool.forward(query)
+        results = DuckDuckGoSearchTool(query)
         if results and results != "None":
             return results
         else: