fixed checker raised incorrectly

taipy/core/config/checkers/_data_node_config_checker.py

@@ -241,9 +241,10 @@ class _DataNodeConfigChecker(_ConfigChecker):
         if not isinstance(data_node_config.exposed_type, str):
             return
         if data_node_config.exposed_type not in DataNodeConfig._ALL_EXPOSED_TYPES:
+            valid_exposed_types_str = ", ".join([f'"{x}"' for x in DataNodeConfig._ALL_EXPOSED_TYPES])
             self._error(
                 data_node_config._EXPOSED_TYPE_KEY,
                 data_node_config.exposed_type,
                 f"The `{data_node_config._EXPOSED_TYPE_KEY}` of DataNodeConfig `{data_node_config_id}` "
-                f'must be either "pandas", "numpy", or a custom type.',
+                f"must be either {valid_exposed_types_str}, or a custom type.",
             )