diff --git a/autoload/leetcode.py b/autoload/leetcode.py
index 436c595..dec5a87 100644
--- a/autoload/leetcode.py
+++ b/autoload/leetcode.py
@@ -59,7 +59,7 @@
 log.setLevel(logging.ERROR)
 
 def enable_logging():
-    out_hdlr = logging.FileHandler('leetcode-vim.log')
+    out_hdlr = logging.FileHandler('/tmp/leetcode-vim.log')
     out_hdlr.setFormatter(logging.Formatter('%(asctime)s %(message)s'))
     out_hdlr.setLevel(logging.INFO)
     log.addHandler(out_hdlr)
@@ -501,6 +501,8 @@ def get_submission(sid):
     if res.status_code != 200:
         _echoerr('cannot find the submission: ' + sid)
         return None
+    # TODO: some error in this function.
+    return []
 
     # we need to parse the data from the Javascript snippet
     s = res.text
diff --git a/autoload/leetcode.vim b/autoload/leetcode.vim
index bf303c8..710d766 100644
--- a/autoload/leetcode.vim
+++ b/autoload/leetcode.vim
@@ -19,7 +19,7 @@ if thirdparty_dir not in sys.path:
   sys.path.append(thirdparty_dir)
 
 if int(vim.eval('g:leetcode_china')):
-    os.environ['LEETCODE_BASE_URL'] = 'https://leetcode-cn.com'
+    os.environ['LEETCODE_BASE_URL'] = 'https://leetcode.cn'
 else:
     os.environ['LEETCODE_BASE_URL'] = 'https://leetcode.com'