>Your first ui-view is not named.....

I know it's not named. This is to allow a loop like this:

<tabset vertical="true" type="pills">
                                    <tab ng-repeat="tab in tabsViews" select="selectView(tab.index)" ng-show="tab.isVisible"
                                         class=" {{tabsViews[tab.index-1]['invalid'] ? 'invalid-tab': 'valid-tab' }}">
                                        <tab-heading>{{tab.title}}</tab-heading>
                                    </tab>
                                </tabset>