No QueryClient set, like the example

# main.tsx
imports...

// Set up a Router instance
const router = createRouter({
    routeTree,
    context: {
        queryClient,
    },
    defaultPreload: 'intent',
    // Since we're using React Query, we don't want loader calls to ever be stale
    // This will ensure that the loader is always called when the route is preloaded or visited
    defaultPreloadStaleTime: 0,
    scrollRestoration: true,
})

// Register things for typesafety
declare module '@tanstack/react-router' {
    interface Register {
        router: typeof router
    }
}

const rootElement = document.getElementById('app')!

if (!rootElement.innerHTML) {
    const root = ReactDOM.createRoot(rootElement)

    root.render(
        <QueryClientProvider client={queryClient}>
            <RouterProvider router={router} />
        </QueryClientProvider>,
    )
}

#__root.tsx
imports...

export const Route = createRootRouteWithContext<{
    queryClient: QueryClient
}>()({
    component: RootComponent,
    notFoundComponent: () => {
        return (
            <div className="p-2 border border-red-300">
                <p>This is the notFoundComponent configured on root route</p>
            </div>
        )
    },
})

function RootComponent() {
    return (
        <>
            <Outlet />
            <ReactQueryDevtools buttonPosition="top-right" />
            <TanStackRouterDevtools position="bottom-right" />
        </>
    )
}