Update app.py

app.py

@@ -43,7 +43,7 @@ def generate_video(api_key, prompt_text, image_url, model_id, progress=gr.Progre
         # Initialize client
         client = Ark(
             base_url="https://ark.ap-southeast.bytepluses.com/api/v3",
-            api_key=os.environ.get("ARK_API_KEY"),
+            api_key=os.environ.get("Key"),
         )
         
         progress(0.1, desc="Creating video generation request...")