How to fix 'NoneType' object has no attribute 'lower’ in ComfyUI?

Related errors,

• Error occurred when executing CR Apply LoRA Stack: Error while deserializing header: MetadataIncompleteBuffer

Those normally pop up when your models files are corrupted or uncompleted,

1. Check all models and see if they are the right ones
2. Check all models integrity (see this link for detailed instruction on how to do checksum verification). If the sha256 value is different from what HuggingFace or Civitai listed, then your local model/lora is corrupted.
1. Where to find Sha256 of a model in HuggingFace?

2. Where to find Sha256 of a model in Civitai?

3. Re-download the model files and re-verify the sha256 of the downloaded files.