Update app.py

app.py

@@ -19,7 +19,7 @@ try:
     locnar_eval = load_dataset('google/imageinwords', token=auth_token, trust_remote_code=True, name="LocNar_Eval")
     cm_3600 = load_dataset('google/imageinwords', token=auth_token, trust_remote_code=True, name="CM_3600")
 except Exception as e:
-    logging.error("could you fetch the datasets with error: %s", e)
+    raise ValueError("could you fetch the datasets with error: %s", e)
 
 _SELECTOR_TO_DATASET = {
     "IIW-400": iiw_400,