diff --git a/.gitignore b/.gitignore
index bbfb9425a..ba322c9e5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,7 +14,6 @@
 # mac
 *.DS_Store
 .bashrc
-public/sync_failed_users.dic
 # Ignore all logfiles and tempfiles.
 /log/*
 /tmp/*
diff --git a/public/sync_failed_users.dic b/public/sync_failed_users.dic
index 8c3121270..e69de29bb 100644
--- a/public/sync_failed_users.dic
+++ b/public/sync_failed_users.dic
@@ -1,3 +0,0 @@
-user_info---{"admin"=>false, "auth_source_id"=>nil, "excellent_student"=>0, "excellent_teacher"=>0, "firstname"=>"", "gid"=>nil, "hashed_password"=>"40d6620ee6cfad9cfa4e467c738bee3e1655ae1e", "identity_url"=>nil, "language"=>"zh", "last_login_on"=>"2018-06-01T15:58:18+08:00", "lastname"=>"陈鑫", "login"=>"chenxinnju", "mail"=>"chenxin@nju.edu.cn", "mail_notification"=>"all", "salt"=>"2b84bf37cc029b1b8851100e28ca6e50", "status"=>1, "visits"=>5},errors--undefined method `result' for #<Hash:0x00007f8e80fd6860>
-[Time---2020-03-17 14:31:19 +0800，user_info---{"admin"=>false, "auth_source_id"=>nil, "excellent_student"=>0, "excellent_teacher"=>0, "firstname"=>"涛", "gid"=>10, "hashed_password"=>"b09f57a0362c70499649008a7ddde1fe8d63add9", "identity_url"=>nil, "language"=>"zh", "last_login_on"=>"2018-06-06T22:49:55+08:00", "lastname"=>"王", "login"=>"wangtao", "mail"=>"271024963@qq.com", "mail_notification"=>"all", "salt"=>"12fd90aa8017b98f5a1ce2a4920485dc", "status"=>1, "visits"=>4262}，errors--验证失败: 登录名已经被使用, 邮箱已经被使用]
-