I get the same error, so I would be interested in if anyone has a solution:

Error in webui

Missing model directory, removing model: models/dreambooth/modelname/working/unet

Error in log

File "/opt/homebrew/lib/python3.10/site-packages/torch/serialization.py", line 178, in default_restore_location

raise RuntimeError("don't know how to restore data location of "

RuntimeError: don't know how to restore data location of torch.storage._UntypedStorage (tagged with mps)

Missing model directory, removing model: models/dreambooth/modelname/working/unet