diff --git a/metagpt/configs/llm_config.py b/metagpt/configs/llm_config.py
index 469613dc1..0284c8993 100644
--- a/metagpt/configs/llm_config.py
+++ b/metagpt/configs/llm_config.py
@@ -94,8 +94,8 @@ class LLMConfig(YamlModel):
     @classmethod
     def check_llm_key(cls, v):
         if v in ["", None, "YOUR_API_KEY"]:
-            repo_config_path=(METAGPT_ROOT / "config/config2.yaml")
-            root_config_path=(CONFIG_ROOT / "config2.yaml")
+            repo_config_path = METAGPT_ROOT / "config/config2.yaml"
+            root_config_path = CONFIG_ROOT / "config2.yaml"
             if root_config_path.exists():
                  raise ValueError(
                     f"Please set your API key in {root_config_path}. If you also set your config in {repo_config_path}, \nthe former will overwrite the latter. This may cause unexpected result.\n")