Couldn’t start the app because 'http://127.0.0.1:7860/gradio_api/startup-events' failed (code 500).

Currently enabled native sdp backends: ['flash', 'math', 'mem_efficient', 'cudnn']
Xformers is not installed!
Flash Attn is not installed!
Sage Attn is not installed!
Namespace(share=False, server='127.0.0.1', port=None, inbrowser=True)
Free VRAM 22.759765625 GB
High-VRAM Mode: False
Downloading shards: 100%|████████████████████████████████████████████████████████████████████████| 4/4 [00:00
block.launch(
File "C:\framepack_cu126_torch26\system\python\lib\site-packages\gradio\blocks.py", line 2685, in launch
raise Exception(
Exception:


Start in demo_gradio.py at the block.launch call shown in the traceback, then reproduce the startup failure to capture the missing exception details. Done means the app launches without the Gradio startup-events 500 error; no test file is mentioned in the issue.

Written by the indexing model from the issue text.