/**
 * "Event not found" fallback shown when the config fails to load.
 *
 * `loadConfig` fetches the event's data document (`data.js`); if that 404s or
 * fails validation the event data is missing and the floor plan cannot
 * initialize. Instead of leaving a blank or
 * half-broken view, we render a short message inside the target element, centered
 * within whatever box it already occupies — full-screen on a standalone page, or
 * the integrator's container when embedded — so it never escapes the host page's
 * layout. (That containment is why no host check is needed.)
 *
 * Deliberately plain-DOM (no React/MobX) so it works even though the floor plan
 * never booted, and it avoids flex `gap` (unsupported on the SDK's old-WebView
 * targets, e.g. chrome66) — the subtitle uses a margin instead.
 */
/** Renders a centered "Event not found" message inside the target element. */
export declare function showEventNotFound(element: HTMLElement): void;
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