# Missing evaluation result

Learn how to define an initial result for server rendering.

If you see the error below when using the [`useEvaluation`](/reference/sdk/react/api/hooks/use-evaluation) hook or [`<Personalization>`](/reference/sdk/react/api/components/personalization) component, you probably forgot to specify an [initial value](/reference/sdk/react/api/components/personalization#initial-prop).

> **Error**
>
> The initial value is required for server-side rendering (SSR).

The initial result is required to pre-render the content on the server, as the actual result is evaluated on the client side when using hooks or components.

For full server-side rendering support, use the [`evaluate`](/reference/sdk/react/api/functions/evaluate) function or one of our framework-specific integrations, like the [Next.js SDK](/reference/sdk/nextjs).