diff --git a/src/rougail/cli/__main__.py b/src/rougail/cli/__main__.py
index 22a3d0b..7fb3cdb 100644
--- a/src/rougail/cli/__main__.py
+++ b/src/rougail/cli/__main__.py
@@ -46,13 +46,19 @@ def _main():
         fake_rougail_config = {'step.user_data': 'environment',
                                'environment.default_environment_name': 'ROUGAILCLI',
                                }
-        UserDatas(cmd_config).user_datas(RougailUserDataEnvironment(cmd_config, rougailconfig=fake_rougail_config).run())
+        user_data = UserDatas(cmd_config).user_datas(RougailUserDataEnvironment(cmd_config, rougailconfig=fake_rougail_config).run())
+        if user_data["errors"]:
+            raise Exception(user_data["errors"][0])
+        if user_data["warnings"]:
+            raise Exception(user_data["warnings"][0])
     parser = TiramisuCmdlineParser(
         cmd_config,
         add_extra_options=False,
         short_name_max_len=2,
     )
     parser.parse_args()
+    global print_traceback
+    print_traceback = rougailconfig["cli.debug"]
     cmd_config.property.setdefault(origin_prop, 'read_write', 'append')
     cmd_config.property.remove("not_for_commandline")
     cmd_config.property.read_only()
@@ -129,8 +135,13 @@ def _main():
 
 
 def main():
+    global print_traceback
+    print_traceback = False
     try:
         _main()
     except Exception as err:
+        if print_traceback:
+            import traceback
+            traceback.print_exc()
         print(_("ERROR: {0}").format(err))
         exit(1)