diff --git a/seahub/api2/endpoints/search_user.py b/seahub/api2/endpoints/search_user.py
index 0d1dd30958..d8eafde07d 100644
--- a/seahub/api2/endpoints/search_user.py
+++ b/seahub/api2/endpoints/search_user.py
@@ -1,5 +1,6 @@
 # Copyright (c) 2012-2016 Seafile Ltd.
 import json
+import logging
 
 from django.db.models import Q
 from django.http import HttpResponse
@@ -9,8 +10,6 @@ from rest_framework.permissions import IsAuthenticated
 from rest_framework.views import APIView
 from rest_framework import status
 
-import seaserv
-
 from seaserv import ccnet_api
 
 from seahub.api2.authentication import TokenAuthentication
@@ -26,6 +25,8 @@ from seahub.avatar.templatetags.avatar_tags import api_avatar_url
 from seahub.settings import ENABLE_GLOBAL_ADDRESSBOOK, \
     ENABLE_SEARCH_FROM_LDAP_DIRECTLY
 
+logger = logging.getLogger(__name__)
+
 try:
     from seahub.settings import CLOUD_MODE
 except ImportError:
@@ -59,8 +60,12 @@ class SearchUser(APIView):
 
                     # get all org users
                     url_prefix = request.user.org.url_prefix
-                    # TODO all_org_users = ccnet_api.get_org_users_by_url_prefix(url_prefix, -1, -1)
-                    all_org_users = seaserv.get_org_users_by_url_prefix(url_prefix, -1, -1)
+                    try:
+                        all_org_users = ccnet_api.get_org_users_by_url_prefix(url_prefix, -1, -1)
+                    except Exception as e:
+                        logger.error(e)
+                        error_msg = 'Internal Server Error'
+                        return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, error_msg)
 
                     limited_emails = []
                     for org_user in all_org_users:
@@ -150,17 +155,17 @@ def format_searched_user_result(request, users, size):
 def search_user_from_ccnet(q):
     users = []
 
-    db_users = seaserv.ccnet_threaded_rpc.search_emailusers('DB', q, 0, 10)
+    db_users = ccnet_api.search_emailusers('DB', q, 0, 10)
     users.extend(db_users)
 
     count = len(users)
     if count < 10:
-        ldap_imported_users = seaserv.ccnet_threaded_rpc.search_emailusers('LDAP', q, 0, 10 - count)
+        ldap_imported_users = ccnet_api.search_emailusers('LDAP', q, 0, 10 - count)
         users.extend(ldap_imported_users)
 
     count = len(users)
     if count < 10 and ENABLE_SEARCH_FROM_LDAP_DIRECTLY:
-        all_ldap_users = seaserv.ccnet_threaded_rpc.search_ldapusers(q, 0, 10 - count)
+        all_ldap_users = ccnet_api.search_ldapusers(q, 0, 10 - count)
         users.extend(all_ldap_users)
 
     # `users` is already search result, no need search more