diff --git a/Makefile b/Makefile
index 516c4e8..ee172f3 100644
--- a/Makefile
+++ b/Makefile
@@ -5,5 +5,5 @@ default:
 
 .PHONY: lint
 lint:
-	black --check .
+	black .
 	pylint --recursive=yes .
diff --git a/crawlers/base_crawler.py b/crawlers/base_crawler.py
index fa34c24..644131a 100644
--- a/crawlers/base_crawler.py
+++ b/crawlers/base_crawler.py
@@ -1,11 +1,12 @@
-from abc import ABCMeta, abstractmethod
-import re
 import datetime
-from bs4 import BeautifulSoup
-from pytz import timezone
-import urllib3
 import json
+import re
+from abc import ABCMeta, abstractmethod
+
 import aiohttp
+import urllib3
+from bs4 import BeautifulSoup
+from pytz import timezone
 
 
 def text_normalizer(text, only_letters=False):
@@ -189,15 +190,22 @@ async def run(self, url=None, **kwargs):
         urllib3.disable_warnings()
         if url is None:
             url = self.url
-        async with aiohttp.ClientSession(headers=self.headers, connector=aiohttp.TCPConnector(ssl=False)) as session:
-            async with session.get(url) as response:
-                try:
+        try:
+            async with aiohttp.ClientSession(
+                headers=self.headers,
+                connector=aiohttp.TCPConnector(ssl=False),
+            ) as session:
+                async with session.get(url) as response:
+                    if response.status != 200:
+                        print(f"Failed to fetch {url}: Status code {response.status}")
+                        return
                     html = await response.read()
                     # html = await response.text()
                     soup = BeautifulSoup(html, "html.parser")
                     self.crawl(soup, **kwargs)
-                except Exception as e:
-                    print(f"Error in Run: {str(e)}")
+        except Exception as e:
+            print(f"Error in Run: {str(e)}")
+            print(f"URL: {url}")
 
     def normalize(self, meal, **kwargs):
         for normalizer_cls in self.normalizer_classes:
diff --git a/crawlers/snuco_crawler.py b/crawlers/snuco_crawler.py
index a66816e..a5d2ad3 100644
--- a/crawlers/snuco_crawler.py
+++ b/crawlers/snuco_crawler.py
@@ -1,15 +1,16 @@
 import asyncio
 import datetime
 import re
+
 from pytz import timezone
 
 from crawlers.base_crawler import (
+    FindParenthesisHash,
+    FindPrice,
+    Meal,
     MealNormalizer,
     RestaurantCrawler,
-    Meal,
     text_normalizer,
-    FindPrice,
-    FindParenthesisHash,
 )
 
 
@@ -48,7 +49,7 @@ def normalize(self, meal, **kwargs):
 
 
 class SnucoRestaurantCrawler(RestaurantCrawler):
-    url = "https://snuco.snu.ac.kr/ko/foodmenu"
+    url = "https://snuco.snu.ac.kr/foodmenu/"
     normalizer_classes = [
         FindPrice,
         FindParenthesisHash,
@@ -77,6 +78,7 @@ class SnucoRestaurantCrawler(RestaurantCrawler):
         "8805545": "3식당",
         "8801939": "302동식당",
         "8898955": "301동식당",
+        "8871123": "220동식당",
     }
     except_restaurant_list = ["기숙사식당"]  # snudorm에서 처리
 
diff --git a/handler.py b/handler.py
index b8cc7f4..ef8eb0a 100644
--- a/handler.py
+++ b/handler.py
@@ -1,20 +1,22 @@
-import pymysql
-import os
+import argparse
+import asyncio
 import datetime
-from pytz import timezone
+import os
 from itertools import compress
-import asyncio
-import argparse
+
+import pymysql
+from pytz import timezone
+
 from crawlers.base_crawler import text_normalizer
-from crawlers.vet_crawler import VetRestaurantCrawler
-from crawlers.snudorm_crawler import SnudormRestaurantCrawler
 from crawlers.snuco_crawler import SnucoRestaurantCrawler
+from crawlers.snudorm_crawler import SnudormRestaurantCrawler
+from crawlers.vet_crawler import VetRestaurantCrawler
 from slack import (
-    send_new_restaurants_message,
+    _send_slack_message,
     send_deleted_menus_message,
-    send_new_menus_message,
     send_edited_menus_message,
-    _send_slack_message,
+    send_new_menus_message,
+    send_new_restaurants_message,
 )
 
 
@@ -209,7 +211,7 @@ def crawl(event, context):
     except Exception as e:
         siksha_db.rollback()
         print(e)
-        _send_slack_message("Crawling has been failed")
+        _send_slack_message(f"Crawling has been failed: {str(e)}")
         return "Crawling has been failed"
     finally:
         cursor.close()
diff --git a/slack.py b/slack.py
index 179b399..cfe5b40 100644
--- a/slack.py
+++ b/slack.py
@@ -1,14 +1,22 @@
-import requests
 import os
 
+import requests
+
 
 def _send_slack_message(message: str):
     slack_token = os.environ.get("SLACK_TOKEN")
+    slack_channel = os.environ["SLACK_CHANNEL"]
     if not slack_token:
+        print("No Slack token provided. Skipping sending message.")
         return
-    body = {"channel": slack_token, "text": message}
-    headers = {"Authorization": f'Bearer {os.environ["SLACK_TOKEN"]}'}
-    requests.post("https://slack.com/api/chat.postMessage", headers=headers, data=body, timeout=100)
+    body = {"channel": slack_channel, "text": message}
+    headers = {"Authorization": f"Bearer {slack_token}"}
+    try:
+        res = requests.post("https://slack.com/api/chat.postMessage", headers=headers, data=body, timeout=100)
+        res.raise_for_status()
+    except Exception as e:
+        print(f"Failed to send Slack message: {str(e)}")
+        print(f"Response: {e.response.text if e.response else 'No response'}")
 
 
 def send_deleted_menus_message(menus: list):