Help! How to add a model?

[SunriseB]

There is a default model named 'v1-5-pruned-emaonly.safetensors', it's useful but i want to try more different models. And then I add sd3-medium and sd3.5-medium，but when I choose the two models, something always going wrong.
This is current state:

And when I choose one of those three new models(for example: sd3.5), there is the wrong infomation:

changing setting sd_model_checkpoint to sd3.5_medium.safetensors [11fe06e223]: AttributeError
Traceback (most recent call last):
File "/Users/lizhou/Projects/sd/stable-diffusion-webui/modules/options.py", line 146, in set
option.onchange()
File "/Users/lizhou/Projects/sd/stable-diffusion-webui/modules/call_queue.py", line 13, in f
res = func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^
File "/Users/lizhou/Projects/sd/stable-diffusion-webui/modules/initialize_util.py", line 174, in
shared.opts.onchange("sd_model_checkpoint", wrap_queued_call(lambda: sd_models.reload_model_weights()), call=False)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/lizhou/Projects/sd/stable-diffusion-webui/modules/sd_models.py", line 764, in reload_model_weights
sd_model = reuse_model_from_already_loaded(sd_model, checkpoint_info, timer)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/lizhou/Projects/sd/stable-diffusion-webui/modules/sd_models.py", line 713, in reuse_model_from_already_loaded
send_model_to_cpu(sd_model)
File "/Users/lizhou/Projects/sd/stable-diffusion-webui/modules/sd_models.py", line 573, in send_model_to_cpu
if m.lowvram:
^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'lowvram'

So how can I fix this error and use the other model？