anchor.diff:            });
           }.bind(this),
           error: function(xhr, status, text) {
  -          console.log("got error");
             var error = text + ': ' + xhr.responseText;
             this.setState({
               error: error
  
positive.code:           <AddGroupButton refresh={this.props.refresh} />
            <div className={'wrapRightGroups'}>
              <Table data={groups_data} columns={columns} filters={filters} 
                search_placeholder={'<%= j raw I18n.t('groups.search_groups') %>'} />
            </div>
          </div>
  
negative.code:     componentWillMount: function() {
        this.refresh();
      },
      updateSelectedStudents: function(students) {
        this.setState({selected_students: students});
      },
      updateSelectedGroups: function(groups) {
  