Add SDK token error note

app.py

@@ -144,6 +144,9 @@ with gr.Blocks(theme=gr.themes.Soft()) as demo:
     
     gr.HTML("""
     <h1 style="text-align: center;">MM-StoryAgent</h1>
+    <div style="padding: 10px; background-color: #fffbcc; border: 1px solid #ffe564; border-radius:4px;">
+        <strong>Note: </strong>If generated images can be previewed but the video generation fails, it is due to AliYun SDK token expiration issue. Please contact [email protected].
+    </div>
     <p style="font-size: 16px;">This is a demo for generating attractive storytelling videos based on the given story setting.</p>
     <p style="font-size: 16px;">Depending on the chapter number, the generation may take a long time. Please be patient.</p>
     """)
@@ -256,4 +259,4 @@ with gr.Blocks(theme=gr.themes.Soft()) as demo:
 
 
 if __name__ == "__main__":
-    demo.launch()
+    demo.launch()