Failed to create model quickly; will retry using slow method.
changing setting sd_model_checkpoint to ponyDiffusionV6XL_v6StartWithThisOne.safetensors [67ab2fd8ec]: AssertionError
Traceback (most recent call last):
  File "C:\est\stable-diffusion-webui\modules\options.py", line 165, in set
    option.onchange()
  File "C:\est\stable-diffusion-webui\modules\call_queue.py", line 13, in f
    res = func(*args, **kwargs)
  File "C:\est\stable-diffusion-webui\modules\initialize_util.py", line 181, in <lambda>
    shared.opts.onchange("sd_model_checkpoint", wrap_queued_call(lambda: sd_models.reload_model_weights()), call=False)
  File "C:\est\stable-diffusion-webui\modules\sd_models.py", line 879, in reload_model_weights
    load_model(checkpoint_info, already_loaded_state_dict=state_dict)
  File "C:\est\stable-diffusion-webui\modules\sd_models.py", line 732, in load_model
    sd_model = instantiate_from_config(sd_config.model)
  File "C:\est\stable-diffusion-webui\repositories\stable-diffusion-stability-ai\ldm\util.py", line 89, in instantiate_from_config
    return get_obj_from_str(config["target"])(**config.get("params", dict()))
  File "C:\est\stable-diffusion-webui\repositories\generative-models\sgm\models\diffusion.py", line 65, in __init__
    self._init_first_stage(first_stage_config)
  File "C:\est\stable-diffusion-webui\repositories\generative-models\sgm\models\diffusion.py", line 106, in _init_first_stage
    model = instantiate_from_config(config).eval()
  File "C:\est\stable-diffusion-webui\repositories\generative-models\sgm\util.py", line 175, in instantiate_from_config
    return get_obj_from_str(config["target"])(**config.get("params", dict()))
  File "C:\est\stable-diffusion-webui\repositories\generative-models\sgm\models\autoencoder.py", line 295, in __init__
    self.encoder = Encoder(**ddconfig)
  File "C:\est\stable-diffusion-webui\repositories\generative-models\sgm\modules\diffusionmodules\model.py", line 553, in __init__
    self.mid.attn_1 = make_attn(block_in, attn_type=attn_type)
  File "C:\est\stable-diffusion-webui\repositories\generative-models\sgm\modules\diffusionmodules\model.py", line 286, in make_attn
    assert XFORMERS_IS_AVAILABLE, (
AssertionError: We do not support vanilla attention in 1.13.1+cu117 anymore, as it is too expensive. Please install xformers via e.g. 'pip install xformers==0.0.16'