diff --git a/joj3_config_generator/loader.py b/joj3_config_generator/loader.py
index eff0c83..1678a31 100644
--- a/joj3_config_generator/loader.py
+++ b/joj3_config_generator/loader.py
@@ -5,7 +5,7 @@ from typing import Any, Dict, Tuple, Type, cast
 import inquirer
 import tomli
 import yaml
-from pydantic import AliasChoices, BaseModel
+from pydantic import AliasChoices, BaseModel, ValidationError
 
 from joj3_config_generator.models import answer, joj1, repo, task
 from joj3_config_generator.models.common import Memory, Time
@@ -166,10 +166,22 @@ def load_joj3_toml(
 
     repo_obj = tomli.loads(repo_toml_path.read_text())
     task_obj = tomli.loads(task_toml_path.read_text())
-    repo_conf = repo.Config(**repo_obj)
+    try:
+        repo_conf = repo.Config(**repo_obj)
+    except ValidationError as e:
+        logger.error(
+            f"Error parsing {repo_toml_path}, most likely to be unknown fields, check the latest sample toml carefully:\n{e}"
+        )
+        raise
     repo_conf.root = root_path
     repo_conf.path = repo_toml_path.relative_to(root_path)
-    task_conf = task.Config(**task_obj)
+    try:
+        task_conf = task.Config(**task_obj)
+    except ValidationError as e:
+        logger.error(
+            f"Error parsing {task_toml_path}, most likely to be unknown fields, check the latest sample toml carefully:\n{e}"
+        )
+        raise
     task_conf.root = root_path
     task_conf.path = task_toml_path.relative_to(root_path)
     check_unnecessary_fields(repo.Config, repo_obj, repo_toml_path)
diff --git a/joj3_config_generator/main.py b/joj3_config_generator/main.py
index c1b65f4..107a3ce 100644
--- a/joj3_config_generator/main.py
+++ b/joj3_config_generator/main.py
@@ -94,6 +94,7 @@ def convert(
     """
     app.pretty_exceptions_enable = False
     logger.info(f"Converting files in {root.absolute()}")
+    error_json_paths = []
     for repo_toml_path in root.glob("**/repo.toml"):
         if not any(p != repo_toml_path for p in repo_toml_path.parent.glob("*.toml")):
             fallback_toml_path = repo_toml_path.parent / "conf.toml"
@@ -109,7 +110,13 @@ def convert(
             logger.info(
                 f"Converting {repo_toml_path} & {task_toml_path} to {result_json_path}"
             )
-            repo_conf, task_conf = load_joj3_toml(root, repo_toml_path, task_toml_path)
+            try:
+                repo_conf, task_conf = load_joj3_toml(
+                    root, repo_toml_path, task_toml_path
+                )
+            except Exception:
+                error_json_paths.append(result_json_path)
+                continue
             result_model = convert_joj3_conf(repo_conf, task_conf)
             result_dict = result_model.model_dump(
                 mode="json", by_alias=True, exclude_none=True
@@ -117,3 +124,8 @@ def convert(
             with result_json_path.open("w", newline="") as result_file:
                 json.dump(result_dict, result_file, ensure_ascii=False, indent=4)
                 result_file.write("\n")
+    if error_json_paths:
+        logger.error(
+            f"Failed to convert {len(error_json_paths)} file(s): {', '.join(str(json_path) for json_path in error_json_paths)}. Check previous errors for details."
+        )
+        raise typer.Exit(code=1)
diff --git a/tests/convert/extra-field/repo.toml b/tests/convert/extra-field/repo.toml
new file mode 100644
index 0000000..e69de29
diff --git a/tests/convert/extra-field/task.toml b/tests/convert/extra-field/task.toml
new file mode 100644
index 0000000..c547a5d
--- /dev/null
+++ b/tests/convert/extra-field/task.toml
@@ -0,0 +1,4 @@
+name = "extra-field"
+extra-field = "extra-field value"
+extra-dict.extra-field = "extra-dict.extra-field value"
+limit.extra-field = "limit.extra-field value"
diff --git a/tests/convert/test_convert_cases.py b/tests/convert/test_convert_cases.py
index 0f9137b..284043a 100644
--- a/tests/convert/test_convert_cases.py
+++ b/tests/convert/test_convert_cases.py
@@ -1,3 +1,6 @@
+import pytest
+from pydantic import ValidationError
+
 from tests.convert.utils import load_case
 
 
@@ -29,6 +32,11 @@ def test_empty() -> None:
     load_case("empty")
 
 
+def test_extra_field() -> None:
+    with pytest.raises(ValidationError):
+        load_case("extra-field")
+
+
 def test_full() -> None:
     load_case("full")