Is it possible to train on CKPT saved model?

[Exozze]

I choose local folder with single .ckpt NAI model, but when I start training, I getting this error:
Traceback (most recent call last):
File "/train_dreambooth.py", line 695, in
main()
File "/train_dreambooth.py", line 376, in main
args.pretrained_model_name_or_path, torch_dtype=torch_dtype, use_auth_token=True
File "/opt/conda/lib/python3.7/site-packages/diffusers/pipeline_utils.py", line 402, in from_pretrained
config_dict = cls.get_config_dict(cached_folder)
File "/opt/conda/lib/python3.7/site-packages/diffusers/configuration_utils.py", line 218, in get_config_dict
f"Error no file named {cls.config_name} found in directory {pretrained_model_name_or_path}."
OSError: Error no file named model_index.json found in directory /input_model.

[smy20011]

Duplicate of #42
Update the title to reflect the issue.