fix in temp env var

app.py

@@ -15,7 +15,8 @@ DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"
 class BasicAgent:
     def __init__(self):
         self.all_tools = build_tool()
-        self.react_graph = build_langgraph(os.getenv("PROVIDER"), model=os.getenv("MODEL"), temperature=os.getenv("TEMPERATURE"), all_tools=self.all_tools)
+        self.react_graph = build_langgraph(os.getenv("PROVIDER"), model=os.getenv("MODEL"), 
+                                           temperature=float(os.getenv("TEMPERATURE")), all_tools=self.all_tools)
         print("BasicAgent initialized.")
 
     def __call__(self, question: str) -> str: