Update app.py

Fix model loading issue

app.py

@@ -30,13 +30,14 @@ tags_metadata = [
 ]
 
 load_dotenv()
-MLFLOW_TRACKING_URI = os.environ["MLFLOW_TRACKING_APP_URI"]
+MLFLOW_TRACKING_APP_URI = os.environ["MLFLOW_TRACKING_APP_URI"]
 AWS_ACCESS_KEY_ID = os.environ["AWS_ACCESS_KEY_ID"]
 AWS_SECRET_ACCESS_KEY = os.environ["AWS_SECRET_ACCESS_KEY"]
+
 MODEL_URI = "models:/climate-fake-news-detector-model-XGBoost-v1@production"
-mlflow.set_tracking_uri(MLFLOW_TRACKING_URI)
-model_uri = MODEL_URI 
-model = mlflow.sklearn.load_model(model_uri)
+
+mlflow.set_tracking_uri(MLFLOW_TRACKING_APP_URI)
+model = mlflow.sklearn.load_model(MODEL_URI)
 
 app = FastAPI(
     title="API for Climate Fake News Detector",