Repository: stable-diffusion-webui
Issue: Dream Booth Model Training Not Working 
Labels: bug-report

### Checklist

- [ ] The issue exists after disabling all extensions
- [ ] The issue exists on a clean installation of webui
- [X] The issue is caused by an extension, but I believe it is caused by a bug in the webui
- [X] The issue exists in the current version of the webui
- [X] The issue has not been reported before recently
- [ ] The issue has been reported before but has not been fixed yet

### What happened?

Dream Booth Model Training is not working in webui I have given the concept1 directory but it gives me error "exception training model: ''NoneType' object is not subscriptable'." I have another challenge that in parameters>memory attention is set to default but in tutorial I saw they have xformers option :


### Steps to reproduce the problem

1. Go To webui dream booth option
2. Create a model give it a name ;select model type:   v2x-512 source checkpoint: v1-5-pruned-emaonly.safetensors [6ce0161689]
3. in concepts section add images directory path
4.  keep model parameters default 
4.Hit Train

### What should have happened?

the model should train on the images

### What browsers do you use to access the UI ?

_No response_

### Sysinfo

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        "charset-normalizer==3.3.2",
        "clean-fid==0.1.35",
        "click==8.1.7",
        "clip==1.0",
        "colorama==0.4.6",
        "contourpy==1.2.0",
        "cssselect2==0.7.0",
        "cycler==0.12.1",
        "dadaptation==3.2",
        "deprecation==2.1.0",
        "diffusers==0.25.0",
        "discord-webhook==1.3.0",
        "einops==0.4.1",
        "exceptiongroup==1.2.0",
        "facexlib==0.3.0",
        "fastapi==0.94.0",
        "ffmpy==0.3.1",
        "filelock==3.13.1",
        "filterpy==1.4.5",
        "flatbuffers==23.5.26",
        "fonttools==4.47.0",
        "frozenlist==1.4.1",
        "fsspec==2023.12.2",
        "ftfy==6.1.3",
        "future==0.18.3",
        "fvcore==0.1.5.post20221221",
        "gdown==4.7.1",
        "gfpgan==1.3.8",
        "gitdb==4.0.11",
        "gitpython==3.1.40",
        "google-auth-oauthlib==1.0.0",
        "google-auth==2.26.1",
        "gradio-client==0.5.0",
        "gradio==3.41.2",
        "grpcio==1.60.0",
        "h11==0.12.0",
        "httpcore==0.15.0",
        "httpx==0.24.1",
        "huggingface-hub==0.20.2",
        "idna==3.6",
        "imageio==2.33.1",
        "importlib-metadata==7.0.1",
        "importlib-resources==6.1.1",
        "inflection==0.5.1",
        "iopath==0.1.9",
        "jinja2==3.1.2",
        "jsonmerge==1.8.0",
        "jsonschema-specifications==2023.12.1",
        "jsonschema==4.20.0",
        "kiwisolver==1.4.5",
        "kornia==0.6.7",
        "lark==1.1.2",
        "lazy-loader==0.3",
        "lightning-utilities==0.10.0",
        "llvmlite==0.41.1",
        "lmdb==1.4.1",
        "lpips==0.1.4",
        "lxml==5.0.0",
        "markdown==3.5.1",
        "markupsafe==2.1.3",
        "matplotlib==3.8.2",
        "mediapipe==0.10.9",
        "mpmath==1.3.0",
        "multidict==6.0.4",
        "networkx==3.2.1",
        "numba==0.58.1",
        "numpy==1.23.5",
        "oauthlib==3.2.2",
        "omegaconf==2.2.3",
        "open-clip-torch==2.20.0",
        "opencv-contrib-python==4.9.0.80",
        "opencv-python==4.9.0.80",
        "orjson==3.9.10",
        "packaging==23.2",
        "pandas==2.1.4",
        "piexif==1.1.3",
        "pillow==9.5.0",
        "pip==22.2.1",
        "platformdirs==4.1.0",
        "portalocker==2.8.2",
        "protobuf==3.20.0",
        "psutil==5.9.5",
        "pyasn1-modules==0.3.0",
        "pyasn1==0.5.1",
        "pycparser==2.21",
        "pydantic==1.10.13",
        "pydub==0.25.1",
        "pyparsing==3.1.1",
        "pysocks==1.7.1",
        "python-dateutil==2.8.2",
        "python-multipart==0.0.6",
        "pytorch-lightning==1.9.4",
        "pytorch-optimizer==2.12.0",
        "pytz==2023.3.post1",
        "pywavelets==1.5.0",
        "pywin32==306",
        "pyyaml==6.0.1",
        "realesrgan==0.3.0",
        "referencing==0.32.0",
        "regex==2023.12.25",
        "reportlab==4.0.8",
        "requests-oauthlib==1.3.1",
        "requests==2.31.0",
        "resize-right==0.0.2",
        "rpds-py==0.16.2",
        "rsa==4.9",
        "safetensors==0.3.1",
        "scikit-image==0.21.0",
        "scipy==1.11.4",
        "semantic-version==2.10.0",
        "sentencepiece==0.1.99",
        "setuptools==63.2.0",
        "six==1.16.0",
        "smmap==5.0.1",
        "sniffio==1.3.0",
        "sounddevice==0.4.6",
        "soupsieve==2.5",
        "starlette==0.26.1",
        "svglib==1.5.1",
        "sympy==1.12",
        "tabulate==0.9.0",
        "tb-nightly==2.16.0a20240105",
        "tensorboard-data-server==0.7.2",
        "tensorboard==2.13.0",
        "termcolor==2.4.0",
        "tf-keras-nightly==2.16.0.dev2023123010",
        "tifffile==2023.12.9",
        "timm==0.9.2",
        "tinycss2==1.2.1",
        "tokenizers==0.13.3",
        "tomesd==0.1.3",
        "tomli==2.0.1",
        "toolz==0.12.0",
        "torch==2.0.1+cu118",
        "torchdiffeq==0.2.3",
        "torchmetrics==1.2.1",
        "torchsde==0.2.6",
        "torchvision==0.15.2+cu118",
        "tqdm==4.66.1",
        "trampoline==0.1.2",
        "transformers==4.30.2",
        "typing-extensions==4.9.0",
        "tzdata==2023.4",
        "urllib3==2.1.0",
        "uvicorn==0.25.0",
        "wcwidth==0.2.12",
        "webencodings==0.5.1",
        "websockets==11.0.3",
        "werkzeug==3.0.1",
        "wheel==0.42.0",
        "yacs==0.1.8",
        "yapf==0.40.2",
        "yarl==1.9.4",
        "zipp==3.17.0"
    ]
}

### Console logs

```Shell
Applying attention optimization: Doggettx... done.
Model loaded in 5.1s (load weights from disk: 0.7s, create model: 0.7s, apply weights to model: 3.1s, move model to device: 0.1s, load textual inversion embeddings: 0.1s, calculate empty prompt: 0.2s).
Advanced elements visible: False
Reusing loaded model cyberrealistic_v41BackToBasics.safetensors [41b6846108] to load MyModel\MyModel_0.safetensors
Calculating sha256 for D:\stable_diffusion\stable-diffusion-webui\models\Stable-diffusion\MyModel\MyModel_0.safetensors: 0ceb2a1cdb59997700e9364a50da30340149fcc0e9f5dded7aa728a5b4a79bb1
Loading weights [0ceb2a1cdb] from D:\stable_diffusion\stable-diffusion-webui\models\Stable-diffusion\MyModel\MyModel_0.safetensors
Creating model from config: D:\stable_diffusion\stable-diffusion-webui\models\Stable-diffusion\MyModel\MyModel_0.yaml
Applying attention optimization: Doggettx... done.
Model loaded in 6.8s (create model: 0.5s, apply weights to model: 5.9s, move model to device: 0.1s).
Initializing dreambooth training...
                                                                                                                       Init dataset!set:   0%|                                                                           | 0/5 [00:00<?, ?it/s]
Preparing Dataset (With Caching)
Total Buckets 0 - Instance Images: 0 | Class Images: 0 | Max Examples/batch: 0

Total images / batch: 0, total examples: 0it/s]
                  Initializing bucket counter!
Steps: : 0it [00:00, ?it/s]Traceback (most recent call last):
  File "D:\stable_diffusion\stable-diffusion-webui\extensions\sd_dreambooth_extension\dreambooth\ui_functions.py", line 735, in start_training
    result = main(class_gen_method=class_gen_method)
  File "D:\stable_diffusion\stable-diffusion-webui\extensions\sd_dreambooth_extension\dreambooth\train_dreambooth.py", line 1917, in main
    return inner_loop()
  File "D:\stable_diffusion\stable-diffusion-webui\extensions\sd_dreambooth_extension\dreambooth\memory.py", line 126, in decorator
    return function(batch_size, grad_size, prof, *args, **kwargs)
  File "D:\stable_diffusion\stable-diffusion-webui\extensions\sd_dreambooth_extension\dreambooth\train_dreambooth.py", line 1555, in inner_loop
    latents = batch["images"].to(accelerator.device)
TypeError: 'NoneType' object is not subscriptable
Steps: : 0it [00:00, ?it/s]
Duration: 00:00:08
Duration: 00:00:10
```


### Additional information

_No response_