diff --git a/package.json b/package.json
index b371d20..f3a0725 100644
--- a/package.json
+++ b/package.json
@@ -54,7 +54,7 @@
     "lint": "deno lint",
     "format": "deno fmt",
     "build": "unbuild",
-    "play:basic": "bun run ./playground/basicindex.ts",
+    "play:basic": "bun run ./playground/basic/index.ts",
     "test": "npm run test:type && npm run test:unit",
     "test:type": "vitest typecheck --run",
     "test:unit": "vitest run",
diff --git a/src/index.ts b/src/index.ts
index c0be4c1..41403d5 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -344,7 +344,7 @@ export function useTranslation<
 >(event: Event): TranslationFunction<Schema, DefineLocaleMessage> {
   if (event.context.i18n == null) {
     throw new Error(
-      'middleware not initialized, please setup `onRequest` and `onAfterResponse` options of `createApp` with the middleware obtained with `defineI18nRequestMiddleware`',
+      'middleware not initialized, please setup `onRequest` and `onAfterResponse` options of `createApp` with the middleware obtained with `defineI18nMiddleware`',
     )
   }