diff --git a/pytchat/core_async/replaychat.py b/pytchat/core_async/replaychat.py
index b6a43ac..3db6520 100644
--- a/pytchat/core_async/replaychat.py
+++ b/pytchat/core_async/replaychat.py
@@ -168,10 +168,10 @@ class ReplayChatAsync:
             async with aiohttp.ClientSession() as session:
                 while(continuation and self._is_alive):
                     if self._pauser.empty():
-                        #pauseが呼ばれて_pauserが空状態のときは一時停止する
+                        #pause
                         await self._pauser.get()
-                        #resumeが呼ばれて_pauserにitemが入ったら再開する
-                        #直後に_pauserにitem(None)を入れてブロックを防ぐ
+                        #resume
+                        #prohibit from blockng by putting None into _pauser.
                         self._pauser.put_nowait(None)
                     livechat_json = (await
                       self._get_livechat_json(continuation, session, headers)
diff --git a/pytchat/core_multithread/replaychat.py b/pytchat/core_multithread/replaychat.py
index 1f7b922..87686a5 100644
--- a/pytchat/core_multithread/replaychat.py
+++ b/pytchat/core_multithread/replaychat.py
@@ -162,10 +162,10 @@ class ReplayChat:
             with requests.Session() as session:
                 while(continuation and self._is_alive):
                     if self._pauser.empty():
-                        #pauseが呼ばれて_pauserが空状態のときは一時停止する
+                        #pause
                         self._pauser.get()
-                        #resumeが呼ばれて_pauserにitemが入ったら再開する
-                        #直後に_pauserにitem(None)を入れてブロックを防ぐ
+                        #resume
+                        #prohibit from blockng by putting None into _pauser.
                         self._pauser.put_nowait(None)
                     livechat_json = (
                       self._get_livechat_json(continuation, session, headers)
diff --git a/pytchat/mylogger.py b/pytchat/mylogger.py
index 4640307..301a350 100644
--- a/pytchat/mylogger.py
+++ b/pytchat/mylogger.py
@@ -17,7 +17,7 @@ def get_logger(modname,mode=logging.DEBUG):
     logger.addHandler(handler1)
     #create handler2 for recording log file
     if mode <= logging.DEBUG:
-        handler2 = logging.FileHandler(filename="log.txt")
+        handler2 = logging.FileHandler(filename="log.txt", encoding='utf-8')
         handler2.setLevel(logging.ERROR)
         handler2.setFormatter(my_formatter)
 
diff --git a/pytchat/processors/default/processor.py b/pytchat/processors/default/processor.py
index d99cbac..123157a 100644
--- a/pytchat/processors/default/processor.py
+++ b/pytchat/processors/default/processor.py
@@ -4,7 +4,9 @@ from .renderer.textmessage import LiveChatTextMessageRenderer
 from .renderer.paidmessage import LiveChatPaidMessageRenderer
 from .renderer.paidsticker import LiveChatPaidStickerRenderer
 from .renderer.legacypaid import LiveChatLegacyPaidMessageRenderer
-
+from ... import config
+from ... import mylogger
+logger = mylogger.get_logger(__name__,mode=config.LOGGER_MODE)
 
 class Chatdata:
     def __init__(self,chatlist:list, timeout:float):
@@ -60,8 +62,7 @@ class DefaultProcessor:
             renderer.get_snippet()
             renderer.get_authordetails()
         except (KeyError,TypeError,AttributeError) as e:
-            print(f"------{str(type(e))}-{str(e)}----------")
-            print(sitem)
+            logger.error(f"{str(type(e))}-{str(e)} sitem:{str(sitem)}")
             return None
         return renderer