Training does not work AttributeError: 'NoneType' object has no attribute 'detach

The following error message appears and training cannot be started. Is this due to a misconfiguration? Note: This log is from standalone DreamArtist, but the exact same error was output in Extension.

Training at rate of 0.005 until step 30000
Preparing dataset...
100%|██████████████████████████████████████| 1/1 [00:05<00:00,  5.43s/it]
  0%|                                          | 0/30000 [00:01<?, ?it/s]
Error completing request
Arguments: ('emma', '0.005', 1, 'D:\\StableDiffusion\\work\\APT\\emma', 'dream_artist', 512, 512, 30000, 1000, 1000, 'D:\\SDWU\\DreamArtist-stable-diffusion\\textual_inversion_templates\\default.txt', True, True, '', '', 15, 0, 7, -1.0, 512, 512, 5.0, '', True, False, 1, 1) {}
Traceback (most recent call last):
  File "D:\SDWU\DreamArtist-stable-diffusion\modules\ui.py", line 185, in f
    res = list(func(*args, **kwargs))
  File "D:\SDWU\DreamArtist-stable-diffusion\webui.py", line 54, in f
    res = func(*args, **kwargs)
  File "D:\SDWU\DreamArtist-stable-diffusion\modules\dream_artist\ui.py", line 36, in train_embedding
    embedding, filename = modules.dream_artist.cptuning.train_embedding(*args)
  File "D:\SDWU\DreamArtist-stable-diffusion\modules\dream_artist\cptuning.py", line 436, in train_embedding
    f"grad:{embedding.vec.grad.detach().cpu().abs().mean().item():.7f}, "
AttributeError: 'NoneType' object has no attribute 'detach'

[soknife]

Some findings if anyone can corroborate. This setup has worked for me.

1. Create a DreamArtist embedding with any number of positive and negative vectors.
2. DreamArtist train the embedding with a prompt template file that is just “[name]” and for only 1 step (or more haven’t tested if it makes any long term difference).
3. DreamArtist train the embedding again with a prompt template file that is just “[filewords]” and for n steps.

Note you can include fixed text such as “a drawing of” in step 2 or 3, e.g. “a drawing of [name]”

Otherwise I get either the error described in this issue or in #4, if I:

1. Perform steps 2 or 3 out of order
2. Use any prompt template file that combines “[name]” and “[filewords]”, e.g. “a drawing of [name], [filewords]”

[ausboss]

I updated to the latest version and set the Prompt template file to style.txt and the training started normally. I also tried a second run with the same settings, which also seems to work fine. If you had the same error as I did, please give it a try.

yep this worked for me. Thank you for sharing your solution. I switched to style.txt. Clicked train then saw it got passed the error and so I stopped it and now I can use whatever template now and it works.