diff --git a/app/tool/__init__.py b/app/tool/__init__.py
index df15a0a..636e9b8 100644
--- a/app/tool/__init__.py
+++ b/app/tool/__init__.py
@@ -1,13 +1,13 @@
 from app.tool.base import BaseTool
 from app.tool.bash import Bash
 from app.tool.browser_use_tool import BrowserUseTool
+from app.tool.crawl4ai import Crawl4aiTool
 from app.tool.create_chat_completion import CreateChatCompletion
 from app.tool.planning import PlanningTool
 from app.tool.str_replace_editor import StrReplaceEditor
 from app.tool.terminate import Terminate
 from app.tool.tool_collection import ToolCollection
 from app.tool.web_search import WebSearch
-from app.tool.crawl4ai import Crawl4aiTool
 
 
 __all__ = [
@@ -20,5 +20,5 @@ __all__ = [
     "ToolCollection",
     "CreateChatCompletion",
     "PlanningTool",
-    "Crawl4aiTool"
+    "Crawl4aiTool",
 ]
diff --git a/app/tool/crawl4ai.py b/app/tool/crawl4ai.py
index ebd30c7..d0f9133 100644
--- a/app/tool/crawl4ai.py
+++ b/app/tool/crawl4ai.py
@@ -248,7 +248,7 @@ class Crawl4aiTool(BaseTool):
 
             return ToolResult(output="\n".join(output_lines))
 
-        except ImportError as e:
+        except ImportError:
             error_msg = "Crawl4AI is not installed. Please install it with: pip install crawl4ai"
             logger.error(error_msg)
             return ToolResult(error=error_msg)