diff --git a/src/lib/i18n/en.ts b/src/lib/i18n/en.ts
index d8176dd..39dbdbe 100644
--- a/src/lib/i18n/en.ts
+++ b/src/lib/i18n/en.ts
@@ -127,5 +127,10 @@ export default {
       loginWithCode: 'Login with Sync Code',
       login: 'Login'
     }
+  },
+  errorPage: {
+    title: 'Oops!',
+    message: 'The page you’re looking for doesn’t exist. It might have been removed, renamed, or never existed.\n\n </br></br>  Go back to the <a class="error-page__link" href="/">homepage</a> to continue browsing',
+    return: 'Return home',
   }
 }
\ No newline at end of file
diff --git a/src/lib/i18n/ja.ts b/src/lib/i18n/ja.ts
index 0cdff11..8f2757e 100644
--- a/src/lib/i18n/ja.ts
+++ b/src/lib/i18n/ja.ts
@@ -127,5 +127,10 @@ export default {
       loginWithCode: '引き継ぎコードでログイン',
       login: 'ログイン'
     }
+  },
+  errorPage: {
+    title: 'Oops!',
+    message: 'The page you’re looking for doesn’t exist. It might have been removed, renamed, or never existed.\n\n </br></br>  Go back to the <a class="error-page__link" href="/">homepage</a> to continue browsing',
+    return: 'Return home',
   }
 }
diff --git a/src/lib/i18n/zh.ts b/src/lib/i18n/zh.ts
index 305c876..9163ad3 100644
--- a/src/lib/i18n/zh.ts
+++ b/src/lib/i18n/zh.ts
@@ -127,5 +127,10 @@ export default {
       loginWithCode: '用引继码登录',
       login: '登录'
     }
+  },
+  errorPage: {
+    title: 'Oops!',
+    message: 'The page you’re looking for doesn’t exist. It might have been removed, renamed, or never existed.\n\n </br></br> Go back to the <a class="error-page__link" href="/">homepage</a> to continue browsing',
+    return: 'Return home',
   }
 }
\ No newline at end of file
diff --git a/src/lib/server/songs.ts b/src/lib/server/songs.ts
index fbc00de..d41124c 100644
--- a/src/lib/server/songs.ts
+++ b/src/lib/server/songs.ts
@@ -140,7 +140,7 @@ export const getSongUrl = async (id: number | string) => {
 // /////////////////////////////////////////////////////////////////////////////
 // API for Song Preparation
 
-export interface ProgressItem { id: string, task: string, progress: number }
+export interface ProgressItem { task: string, progress: number }
 export interface SongProcessState { items: ProgressItem[], status: 'running' | 'done' | 'error' }
 
 const songProcessingStatus = new Map<number, SongProcessState>()
@@ -152,20 +152,20 @@ export const prepareSong = async (songId: number) => {
     const state: SongProcessState = { items: [], status: 'running' }
     songProcessingStatus.set(songId, state)
 
-    const addTask = (id: string, task: string) => ({ id, task, progress: 0 }).also(it => state.items.push(it))
+    const addTask = (task: string) => ({ task, progress: 0 }).also(it => state.items.push(it))
     try {
         // 1. Get Lyrics
-        const taskLyrics = addTask('lyrics', '从网易云获取歌词')
+        const taskLyrics = addTask('从网易云获取歌词')
         const raw = await getLyricsRaw(songId)
         taskLyrics.progress = 1
         
         if (raw.lang !== 'jpn') {
-             addTask('error', '错误: 不是日语歌曲').progress = -1
+             addTask('错误: 不是日语歌曲').progress = -1
              return state.status = 'error'
         }
 
         // 2. AI Process
-        const taskAI = addTask('ai', 'AI 标注歌词读音')
+        const taskAI = addTask('AI 标注歌词读音')
         
         // Check cache
         if (await checkLyricsProcessed(songId)) taskAI.progress = 1
@@ -176,12 +176,12 @@ export const prepareSong = async (songId: number) => {
         }
 
         // 3. Audio
-        const taskAudio = addTask('music', '从网易云获取音乐')
+        const taskAudio = addTask('从网易云获取音乐')
         await getSongUrl(songId)
         taskAudio.progress = 1
 
         // 4. Source Separation
-        const taskSeparation = addTask('separation', 'AI 人声分离')
+        const taskSeparation = addTask('AI 人声分离')
         const inputPath = path.join(CACHE_DIR, `${songId}/exhigh.mp3`)
         const outputDir = path.join(CACHE_DIR, `${songId}`)
 
@@ -189,14 +189,14 @@ export const prepareSong = async (songId: number) => {
             await separateSong(inputPath, outputDir)
             taskSeparation.progress = 1
         } catch (e: any) {
-            addTask('error', `错误: ${e.message}`).progress = -1
+            addTask(`错误: ${e.message}`).progress = -1
             // Don't fail the whole process, just this step
         }
         
         state.status = 'done'
 
     } catch (e) {
-        addTask('error', `错误: ${eToString(e)}`).progress = -1
+        addTask(`错误: ${eToString(e)}`).progress = -1
         state.status = 'error'
     }
 }
diff --git a/src/routes/+error.svelte b/src/routes/+error.svelte
new file mode 100644
index 0000000..ed9c99a
--- /dev/null
+++ b/src/routes/+error.svelte
@@ -0,0 +1,20 @@
+<script>
+  import AppBar from "$lib/ui/appbar/AppBar.svelte" 
+  import { getI18n } from "$lib/i18n";
+
+  const t = getI18n().errorPage;
+</script>
+
+<svelte:head>
+  <title>404 — Page Not Found</title>
+</svelte:head>
+
+<main> 
+  
+<AppBar title={t.title} >
+</AppBar>
+  <div class="p-content">
+    <p>{@html t.message}</p>
+    <a href="/">{t.return}</a>
+  </div>
+</main>
diff --git a/src/style/app.sass b/src/style/app.sass
index 3ae069f..3719353 100644
--- a/src/style/app.sass
+++ b/src/style/app.sass
@@ -41,4 +41,7 @@ body
 
 .app-container
     max-width: 1200px;
-    margin: 0 auto;
\ No newline at end of file
+    margin: 0 auto;
+
+.error-page__link
+    text-decoration: underline;
\ No newline at end of file