Listens to ui-router for state changes and changes the window location if the current page is an error page.

change-window-location-on-error-page-ui-router-state-change.js

$rootScope.$on('$stateChangeStart', function(evt, to, params){
    var isError = $windowProvider.$get().document.querySelector("meta[name='yourErrorPageTag']");
    if (isError) {
        evt.preventDefault();
        $windowProvider.$get().location = "/apppath/index.html" + $windowProvider.$get().location.hash;
    }
});