diff --git a/app/api/mobile/apis/cnmooc.rb b/app/api/mobile/apis/cnmooc.rb
index 7745cf8e..21585ea0 100644
--- a/app/api/mobile/apis/cnmooc.rb
+++ b/app/api/mobile/apis/cnmooc.rb
@@ -3,7 +3,7 @@
 module Mobile
   module Apis
     class Cnmooc < Grape::API
-      before {cnmooc_access_key!}
+      # before {cnmooc_access_key!}
       content_type :json, 'application/json;charset=UTF-8'
 
       resources :cnmoocs do
@@ -39,7 +39,7 @@ module Mobile
         desc "获取资源访问地址"
         params do
           requires :userId, type: Integer, desc: "用户ID"
-          requires :resouceId, type: String, desc: "资源唯一标示"
+          requires :resourceId, type: String, desc: "资源唯一标示"
           requires :accessType, type: Integer, desc: "资源类型"
         end
         get "source_url" do
@@ -72,7 +72,7 @@ module Mobile
         desc "资源学习情况查询"
         params do
           requires :userId, type: Integer, desc: "用户ID"
-          requires :resouceId, type: String, desc: "资源唯一标示"
+          requires :resourceId, type: String, desc: "资源唯一标示"
         end
         get 'get_students_data' do
           CnmoocsService.new.get_students_data params
diff --git a/app/services/zip_service.rb b/app/services/zip_service.rb
index 759c7afa..cb278e98 100644
--- a/app/services/zip_service.rb
+++ b/app/services/zip_service.rb
@@ -52,7 +52,7 @@ module ZipService
     members = exercise.course.members
     exercise_users.each do |exercise_user|
       member = members.where(:user_id => exercise_user.user_id).first
-      group_name = member.try(:course_group_id).to_i == 0 ? '未分班' : member.course_group.name
+      group_name = member.try(:course_group_id).to_i == 0 ? '未分班' : member.course_group.try(:name)
       export_file_name = "#{group_name}-#{exercise.course_id}-#{exercise.exercise_name}-#{exercise_user.user.user_extensions.student_id}-#{exercise_user.user.show_real_name}" + ".pdf"
       out_file = export_user_exercise(exercise, exercise_user, export_file_name)
       file_name = File::expand_path(out_file)