diff --git a/ycdl/ytrss.py b/ycdl/ytrss.py
index fd3ff19..0e01528 100644
--- a/ycdl/ytrss.py
+++ b/ycdl/ytrss.py
@@ -3,6 +3,7 @@ import bs4
 # away instead of when bs4 tries to parse.
 import lxml
 import requests
+import traceback
 
 from voussoirkit import vlogging
 
@@ -31,14 +32,17 @@ def get_user_videos(channel_id):
     try:
         return _get_user_videos(channel_id)
     except Exception as exc:
-        raise exceptions.RSSAssistFailed(f'Failed to fetch RSS videos.') from exc
+        log.warning(traceback.format_exc())
+        raise exceptions.RSSAssistFailed(f'Failed to fetch RSS videos ({exc}).') from exc
 
 def get_user_videos_since(channel_id, video_id):
     '''
     Return the list of video ids that are more recently released than the
     reference id.
     '''
+    # Let RSSAssistFailed raise.
     video_ids = get_user_videos(channel_id)
+
     try:
         index = video_ids.index(video_id)
     except ValueError: