diff --git a/scenarionet/converter/utils.py b/scenarionet/converter/utils.py
index 5e40d71..ec3997f 100644
--- a/scenarionet/converter/utils.py
+++ b/scenarionet/converter/utils.py
@@ -6,11 +6,13 @@ import math
 import os
 import pickle
 import shutil
-from scenarionet.common_utils import save_summary_anda_mapping
+
 import numpy as np
 import tqdm
 from metadrive.scenario import ScenarioDescription as SD
 
+from scenarionet.common_utils import save_summary_anda_mapping
+
 logger = logging.getLogger(__file__)
 
 
@@ -81,7 +83,8 @@ def write_to_directory(
         if force_overwrite:
             delay_remove = save_path
         else:
-            raise ValueError("Directory already exists! Abort")
+            raise ValueError("Directory already exists! Abort."
+                             "\n Try setting force_overwrite=True or using --overwrite")
 
     summary_file = SD.DATASET.SUMMARY_FILE
     mapping_file = SD.DATASET.MAPPING_FILE
diff --git a/scenarionet/scripts/convert_nuplan.py b/scenarionet/scripts/convert_nuplan.py
index 7278e5f..db863f2 100644
--- a/scenarionet/scripts/convert_nuplan.py
+++ b/scenarionet/scripts/convert_nuplan.py
@@ -15,7 +15,7 @@ if __name__ == '__main__':
                         help="Dataset name, will be used to generate scenario files")
     parser.add_argument("--dataset_path", "-d", default=os.path.join(SCENARIONET_DATASET_PATH, "nuplan"),
                         help="The path of the dataset")
-    parser.add_argument("--version", "-v", default='v1.1', required=True, help="version")
+    parser.add_argument("--version", "-v", default='v1.1', help="version")
     parser.add_argument("--overwrite", action="store_true", help="If the dataset_path exists, overwrite it")
     args = parser.parse_args()
 
diff --git a/scenarionet/scripts/convert_nuscenes.py b/scenarionet/scripts/convert_nuscenes.py
index d8a42a4..263fb58 100644
--- a/scenarionet/scripts/convert_nuscenes.py
+++ b/scenarionet/scripts/convert_nuscenes.py
@@ -15,7 +15,7 @@ if __name__ == '__main__':
                         help="Dataset name, will be used to generate scenario files")
     parser.add_argument("--dataset_path", "-d", default=os.path.join(SCENARIONET_DATASET_PATH, "nuscenes"),
                         help="The path of the dataset")
-    parser.add_argument("--version", "-v", default='v1.0-mini', required=True, help="version")
+    parser.add_argument("--version", "-v", default='v1.0-mini',  help="version")
     parser.add_argument("--overwrite", action="store_true", help="If the dataset_path exists, overwrite it")
     args = parser.parse_args()
 
diff --git a/scenarionet/scripts/convert_pg.py b/scenarionet/scripts/convert_pg.py
index ce6e35a..6c53650 100644
--- a/scenarionet/scripts/convert_pg.py
+++ b/scenarionet/scripts/convert_pg.py
@@ -15,7 +15,7 @@ if __name__ == '__main__':
                         help="Dataset name, will be used to generate scenario files")
     parser.add_argument("--dataset_path", "-d", default=os.path.join(SCENARIONET_DATASET_PATH, "pg"),
                         help="The path of the dataset")
-    parser.add_argument("--version", "-v", default=metadrive.constants.DATA_VERSION, required=True, help="version")
+    parser.add_argument("--version", "-v", default=metadrive.constants.DATA_VERSION,  help="version")
     parser.add_argument("--overwrite", action="store_true", help="If the dataset_path exists, overwrite it")
     args = parser.parse_args()
 
diff --git a/scenarionet/scripts/convert_waymo.py b/scenarionet/scripts/convert_waymo.py
index faeba64..ad0f4d6 100644
--- a/scenarionet/scripts/convert_waymo.py
+++ b/scenarionet/scripts/convert_waymo.py
@@ -14,7 +14,7 @@ if __name__ == '__main__':
                         help="Dataset name, will be used to generate scenario files")
     parser.add_argument("--dataset_path", "-d", default=os.path.join(SCENARIONET_DATASET_PATH, "waymo"),
                         help="The path of the dataset")
-    parser.add_argument("--version", "-v", default='v1.2', required=True, help="version")
+    parser.add_argument("--version", "-v", default='v1.2',  help="version")
     parser.add_argument("--overwrite", action="store_true", help="If the dataset_path exists, overwrite it")
     args = parser.parse_args()