error.js

                    render: function () {
                        var self = this;
                        var state = this.state;
                        var tabIdx = 0;

                        return div(
                            null,

                                ul({className: "nav nav-tabs", key: "tabs"}, state.tabs.map(function (tab) {
                                    tabIdx = tabIdx + 1;

                                    return Tab({
                                        key: "tab-" + tabIdx,
                                        tab: tab,
                                        isActive: state.currentTab === tab,
                                        onTabClick: self.handleTabClicked
                                    });
                                }))
                            );
                    }