diff --git a/seahub/views/ajax.py b/seahub/views/ajax.py
index 50dd32ce29..f6b00aa433 100644
--- a/seahub/views/ajax.py
+++ b/seahub/views/ajax.py
@@ -2295,11 +2295,12 @@ def set_user_folder_perm(request, repo_id):
         if not user_folder_perm:
             try:
                 seafile_api.add_folder_user_perm(repo_id, path, perm, user)
-                send_perm_audit_msg('add-repo-perm', request.user.username, user, \
-                                    repo_id, path, perm)
-            except SearpcError, e:
-                return HttpResponse(json.dumps({"error": e.msg}), status=500,
-                                    content_type=content_type)
+                send_perm_audit_msg('add-repo-perm', request.user.username,
+                                    user, repo_id, path, perm)
+            except SearpcError as e:
+                logger.error(e)
+                return HttpResponse(json.dumps({"error": _('Operation failed')}),
+                                    status=500, content_type=content_type)
         else:
             return HttpResponse(json.dumps({"error": _('Already add this folder permission')}),
                                 status=400, content_type=content_type)
@@ -2308,11 +2309,12 @@ def set_user_folder_perm(request, repo_id):
         if user_folder_perm and user_folder_perm != perm:
             try:
                 seafile_api.set_folder_user_perm(repo_id, path, perm, user)
-                send_perm_audit_msg('modify-repo-perm', request.user.username, user, \
-                                    repo_id, path, perm)
-            except SearpcError, e:
-                return HttpResponse(json.dumps({"error": e.msg}), status=500,
-                                    content_type=content_type)
+                send_perm_audit_msg('modify-repo-perm', request.user.username,
+                                    user, repo_id, path, perm)
+            except SearpcError as e:
+                logger.error(e)
+                return HttpResponse(json.dumps({"error": _('Operation failed')}),
+                                    status=500, content_type=content_type)
         else:
             return HttpResponse(json.dumps({"error": _('Wrong folder permission')}),
                                 status=400, content_type=content_type)
@@ -2321,14 +2323,16 @@ def set_user_folder_perm(request, repo_id):
         if user_folder_perm:
             try:
                 seafile_api.rm_folder_user_perm(repo_id, path, user)
-                send_perm_audit_msg('delete-repo-perm', request.user.username, user, \
-                                    repo_id, path, perm)
-            except SearpcError, e:
-                return HttpResponse(json.dumps({"error": e.msg}), status=500,
-                                    content_type=content_type)
+                send_perm_audit_msg('delete-repo-perm', request.user.username,
+                                    user, repo_id, path, perm)
+            except SearpcError as e:
+                logger.error(e)
+                return HttpResponse(json.dumps({"error": _('Operation failed')}),
+                                    status=500, content_type=content_type)
         else:
             return HttpResponse(json.dumps({"error": _('Please add folder permission first')}),
                                 status=400, content_type=content_type)
+
     return HttpResponse(json.dumps({'success': True}),
                         content_type=content_type)
 
@@ -2364,11 +2368,12 @@ def set_group_folder_perm(request, repo_id):
         if not group_folder_perm:
             try:
                 seafile_api.add_folder_group_perm(repo_id, path, perm, group_id)
-                send_perm_audit_msg('add-repo-perm', request.user.username, \
+                send_perm_audit_msg('add-repo-perm', request.user.username,
                                     group_id, repo_id, path, perm)
-            except SearpcError, e:
-                return HttpResponse(json.dumps({"error": e.msg}), status=500,
-                                    content_type=content_type)
+            except SearpcError as e:
+                logger.error(e)
+                return HttpResponse(json.dumps({"error": _('Operation failed')}),
+                                    status=500, content_type=content_type)
         else:
             return HttpResponse(json.dumps({"error": _('Already add this folder permission')}),
                                 status=400, content_type=content_type)
@@ -2377,11 +2382,12 @@ def set_group_folder_perm(request, repo_id):
         if group_folder_perm and group_folder_perm != perm:
             try:
                 seafile_api.set_folder_group_perm(repo_id, path, perm, group_id)
-                send_perm_audit_msg('modify-repo-perm', request.user.username, \
+                send_perm_audit_msg('modify-repo-perm', request.user.username,
                                     group_id, repo_id, path, perm)
-            except SearpcError, e:
-                return HttpResponse(json.dumps({"error": e.msg}), status=500,
-                                    content_type=content_type)
+            except SearpcError as e:
+                logger.error(e)
+                return HttpResponse(json.dumps({"error": _('Operation failed')}),
+                                    status=500, content_type=content_type)
         else:
             return HttpResponse(json.dumps({"error": _('Wrong folder permission')}),
                                 status=400, content_type=content_type)
@@ -2390,11 +2396,12 @@ def set_group_folder_perm(request, repo_id):
         if group_folder_perm:
             try:
                 seafile_api.rm_folder_group_perm(repo_id, path, group_id)
-                send_perm_audit_msg('delete-repo-perm', request.user.username, \
+                send_perm_audit_msg('delete-repo-perm', request.user.username,
                                     group_id, repo_id, path, perm)
-            except SearpcError, e:
-                return HttpResponse(json.dumps({"error": e.msg}), status=500,
-                                    content_type=content_type)
+            except SearpcError as e:
+                logger.error(e)
+                return HttpResponse(json.dumps({"error": _('Operation failed')}),
+                                    status=500, content_type=content_type)
         else:
             return HttpResponse(json.dumps({"error": _('Please add folder permission first')}),
                                 status=400, content_type=content_type)