Issue Description
SD.Next refuses to start because a package cannot import diffusers.pipelines.pipeline_utils and diffusers.models.autoencoders.autoencoder_kl
This is on ROCm 6.4.4 ( w/ 9070 XT) on SD.Next dev branch.
I have run a clean installation three times and it always fails like that. Maybe an upstream diffusers issue?
Version Platform Description
08:03:59-713163 INFO Starting SD.Next
08:03:59-716766 INFO Logger: file="E:\Work\LLM\sdnext-amd\sdnext.log" level=DEBUG host="Burret-PC" size=77
mode=create
08:03:59-718313 INFO Python: version=3.12.11 platform=Windows bin="E:\Work\LLM\sdnext-amd\venv\Scripts\python.exe"
venv="E:\Work\LLM\sdnext-amd\venv"
08:03:59-984192 INFO Version: app=sd.next updated=2025-09-30 hash=0c1d34721 branch=dev
url=https://github.com/vladmandic/sdnext.git/tree/dev ui=dev
08:04:00-462704 INFO Version: app=sd.next latest=2025-09-29T23:37:58Z hash=0c1d3472 branch=dev
08:04:00-496274 INFO Platform: arch=AMD64 cpu=AMD64 Family 25 Model 33 Stepping 0, AuthenticAMD system=Windows
release=Windows-11-10.0.26100-SP0 python=3.12.11 locale=('English_Germany', '1252')
docker=False
08:04:00-497841 DEBUG Packages: prefix=venv site=['venv', 'venv\Lib\site-packages']
08:04:00-498867 INFO Args: ['--debug', '--use-rocm', '--use-nightly']
08:04:00-499899 DEBUG Setting environment tuning
08:04:00-500927 DEBUG Torch allocator: "garbage_collection_threshold:0.80,max_split_size_mb:512"
08:04:00-501440 DEBUG Install: package="gradio" install required
08:04:53-649988 INFO Verifying torch installation
08:04:53-663400 DEBUG Torch overrides: cuda=False rocm=True ipex=False directml=False openvino=False zluda=False
08:04:53-717742 INFO ROCm: AMD toolkit detected
08:04:53-718768 INFO ROCm: agents=['gfx1201']
08:04:53-719280 INFO ROCm: version=6.4, using agent gfx1201
08:04:53-720303 INFO Python: version=3.12.11 platform=Windows bin="E:\Work\LLM\sdnext-amd\venv\Scripts\python.exe"
venv="E:\Work\LLM\sdnext-amd\venv"
08:04:53-729042 DEBUG Install: package="torch" install required
08:04:53-729556 INFO Torch: download and install in progress... cmd="--no-cache-dir
https://repo.radeon.com/rocm/windows/rocm-rel-6.4.4/torch-2.8.0a0%2Bgitfc14c65-cp312-cp312-win_
amd64.whl
https://repo.radeon.com/rocm/windows/rocm-rel-6.4.4/torchvision-0.24.0a0%2Bc85f008-cp312-cp312-
win_amd64.whl"
08:07:39-147565 DEBUG Install: package="onnx" install required
08:08:01-501310 DEBUG Install: package="onnxruntime" install required
08:08:10-785659 INFO Transformers install: version=4.56.2
08:08:59-351777 INFO Diffusers install: commit=64a5187d96f9376c7cf5123db810f2d2da79d7d0
Relevant log output
08:08:59-351777 INFO Diffusers install: commit=64a5187d96f9376c7cf5123db810f2d2da79d7d0
08:09:44-313217 INFO Install requirements: this may take a while...
08:12:08-942125 INFO Install: verifying requirements
08:12:20-319066 INFO Startup: standard
08:12:20-320095 INFO Verifying submodules
08:12:23-654828 DEBUG Git submodule: extensions-builtin/sd-extension-chainner / main
08:12:23-789477 DEBUG Git submodule: extensions-builtin/sd-extension-system-info / main
08:12:23-972026 DEBUG Git detached head detected: folder="extensions-builtin/sdnext-modernui" reattach=dev
08:12:23-973066 DEBUG Git submodule: extensions-builtin/sdnext-modernui / dev
08:12:24-123361 DEBUG Git submodule: extensions-builtin/stable-diffusion-webui-rembg / master
08:12:24-313565 DEBUG Git detached head detected: folder="wiki" reattach=master
08:12:24-314585 DEBUG Git submodule: wiki / master
08:12:24-527876 DEBUG Installed packages: 165
08:12:24-529414 DEBUG Extensions all: ['sd-extension-chainner', 'sd-extension-system-info', 'sdnext-modernui',
'stable-diffusion-webui-rembg']
08:12:24-872736 DEBUG Extension installer: builtin=True
file="E:\Work\LLM\sdnext-amd\extensions-builtin\stable-diffusion-webui-rembg\install.py"
08:12:31-790680 INFO Extension installed packages: stable-diffusion-webui-rembg
['opencv-python-headless==4.12.0.88', 'pooch==1.8.2', 'pymatting==1.1.14', 'rembg==2.0.67']
08:12:31-792259 DEBUG Extensions all: []
08:12:31-793305 INFO Extensions enabled: ['sd-extension-chainner', 'sd-extension-system-info', 'sdnext-modernui',
'stable-diffusion-webui-rembg']
08:12:31-920411 INFO Install: verifying requirements
08:12:31-924015 DEBUG Setup complete without errors: 1759212752
08:12:31-930206 DEBUG Extension preload: {'extensions-builtin': 0.0, 'extensions': 0.0}
08:12:31-931752 INFO Installer time: total=1272.21 pip=513.37 install=276.87 torch=165.50 requirements=148.11
transformers=48.57 diffusers=44.83 onnx=31.64 base=17.42 packages=8.03
stable-diffusion-webui-rembg=6.92 git=4.26 submodules=4.08 branch=0.79 latest=0.74 version=0.26
installed=0.26 files=0.14 sd-extension-chainner=0.11 sdnext-modernui=0.11
sd-extension-system-info=0.11 amd=0.06
08:12:31-933820 INFO Command line args: ['--debug', '--use-rocm', '--use-nightly'] use_rocm=True use_nightly=True
args=[]
08:12:31-934853 DEBUG Env flags: []
08:12:31-935881 DEBUG Starting module: <module 'webui' from 'E:\\Work\\LLM\\sdnext-amd\\webui.py'>
╭───────────────────────────────────────── Traceback (most recent call last) ──────────────────────────────────────────╮
│E:\Work\LLM\sdnext-amd\venv\Lib\site-packages\diffusers\utils\import_utils.py:974 in _get_module │
│ │
│ 973 try: │
│❱ 974 return importlib.import_module("." + module_name, self.__name__) │
│ 975 except Exception as e: │
│ │
│C:\Users\Burret\.conda\envs\sdnext312\Lib\importlib\__init__.py:90 in import_module │
│ │
│ 89 level += 1 │
│❱ 90 return _bootstrap._gcd_import(name[level:], package, level) │
│ 91 │
│in _gcd_import:1387 │
│in _find_and_load:1360 │
│in _find_and_load_unlocked:1310 │
│in _call_with_frames_removed:488 │
│in _gcd_import:1387 │
│in _find_and_load:1360 │
│ │
│ ... 7 frames hidden ... │
│ │
│E:\Work\LLM\sdnext-amd\venv\Lib\site-packages\diffusers\models\unets\__init__.py:6 in <module> │
│ │
│ 5 from .unet_1d import UNet1DModel │
│❱ 6 from .unet_2d import UNet2DModel │
│ 7 from .unet_2d_condition import UNet2DConditionModel │
│ │
│E:\Work\LLM\sdnext-amd\venv\Lib\site-packages\diffusers\models\unets\unet_2d.py:24 in <module> │
│ │
│ 23 from ..modeling_utils import ModelMixin │
│❱ 24 from .unet_2d_blocks import UNetMidBlock2D, get_down_block, get_up_block │
│ 25 │
│ │
│E:\Work\LLM\sdnext-amd\venv\Lib\site-packages\diffusers\models\unets\unet_2d_blocks.py:36 in <module> │
│ │
│ 35 ) │
│❱ 36 from ..transformers.dual_transformer_2d import DualTransformer2DModel │
│ 37 from ..transformers.transformer_2d import Transformer2DModel │
│ │
│E:\Work\LLM\sdnext-amd\venv\Lib\site-packages\diffusers\models\transformers\__init__.py:20 in <module> │
│ │
│ 19 from .transformer_allegro import AllegroTransformer3DModel │
│❱ 20 from .transformer_bria import BriaTransformer2DModel │
│ 21 from .transformer_chroma import ChromaTransformer2DModel │
│ │
│E:\Work\LLM\sdnext-amd\venv\Lib\site-packages\diffusers\models\transformers\transformer_bria.py:14 in <module> │
│ │
│ 13 from ..attention import AttentionModuleMixin, FeedForward │
│❱ 14 from ..attention_dispatch import dispatch_attention_fn │
│ 15 from ..cache_utils import CacheMixin │
│ │
│E:\Work\LLM\sdnext-amd\venv\Lib\site-packages\diffusers\models\attention_dispatch.py:23 in <module> │
│ │
│ 22 import torch │
│❱ 23 import torch.distributed._functional_collectives as funcol │
│ 24 │
│ │
│E:\Work\LLM\sdnext-amd\venv\Lib\site-packages\torch\distributed\_functional_collectives.py:9 in <module> │
│ │
│ 8 import torch.distributed as dist │
│❱ 9 import torch.distributed.distributed_c10d as c10d │
│ 10 from torch.distributed.device_mesh import DeviceMesh │
│ │
│E:\Work\LLM\sdnext-amd\venv\Lib\site-packages\torch\distributed\distributed_c10d.py:23 in <module> │
│ │
│ 22 from torch._C import _DistStoreError as DistStoreError │
│❱ 23 from torch._C._distributed_c10d import ( │
│ 24 _DistributedBackendOptions, │
╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
ModuleNotFoundError: No module named 'torch._C._distributed_c10d'; 'torch._C' is not a package
The above exception was the direct cause of the following exception:
╭───────────────────────────────────────── Traceback (most recent call last) ──────────────────────────────────────────╮
│E:\Work\LLM\sdnext-amd\venv\Lib\site-packages\diffusers\utils\import_utils.py:974 in _get_module │
│ │
│ 973 try: │
│❱ 974 return importlib.import_module("." + module_name, self.__name__) │
│ 975 except Exception as e: │
│ │
│C:\Users\Burret\.conda\envs\sdnext312\Lib\importlib\__init__.py:90 in import_module │
│ │
│ 89 level += 1 │
│❱ 90 return _bootstrap._gcd_import(name[level:], package, level) │
│ 91 │
│in _gcd_import:1387 │
│in _find_and_load:1360 │
│in _find_and_load_unlocked:1331 │
│in _load_unlocked:935 │
│in exec_module:999 │
│in _call_with_frames_removed:488 │
│ │
│E:\Work\LLM\sdnext-amd\venv\Lib\site-packages\diffusers\pipelines\pipeline_utils.py:47 in <module> │
│ │
│ 46 from ..configuration_utils import ConfigMixin │
│❱ 47 from ..models import AutoencoderKL │
│ 48 from ..models.attention_processor import FusedAttnProcessor2_0 │
│in _handle_fromlist:1412 │
│ │
│E:\Work\LLM\sdnext-amd\venv\Lib\site-packages\diffusers\utils\import_utils.py:964 in __getattr__ │
│ │
│ 963 elif name in self._class_to_module.keys(): │
│❱ 964 module = self._get_module(self._class_to_module[name]) │
│ 965 value = getattr(module, name) │
│ │
│E:\Work\LLM\sdnext-amd\venv\Lib\site-packages\diffusers\utils\import_utils.py:976 in _get_module │
│ │
│ 975 except Exception as e: │
│❱ 976 raise RuntimeError( │
│ 977 f"Failed to import {self.__name__}.{module_name} because of the following error (look up to see │
╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
RuntimeError: Failed to import diffusers.models.autoencoders.autoencoder_kl because of the following error (look up to see its traceback):
No module named 'torch._C._distributed_c10d'; 'torch._C' is not a package
The above exception was the direct cause of the following exception:
╭───────────────────────────────────────── Traceback (most recent call last) ──────────────────────────────────────────╮
│E:\Work\LLM\sdnext-amd\launch.py:335 in <module> │
│ │
│ 334 if __name__ == "__main__": │
│❱ 335 main() │
│ 336 │
│ │
│E:\Work\LLM\sdnext-amd\launch.py:303 in main │
│ │
│ 302 │
│❱ 303 uv, instance = start_server(immediate=True, server=None) │
│ 304 t_server = time.time() │
│ │
│E:\Work\LLM\sdnext-amd\launch.py:212 in start_server │
│ │
│ 211 installer.log.debug(f'Starting module: {server}') │
│❱ 212 module_spec.loader.exec_module(server) │
│ 213 uvicorn = None │
│in exec_module:999 │
│in _call_with_frames_removed:488 │
│ │
│E:\Work\LLM\sdnext-amd\webui.py:12 in <module> │
│ │
│ 11 from threading import Thread │
│❱ 12 import modules.loader │
│ 13 import modules.hashes │
│ │
│E:\Work\LLM\sdnext-amd\modules\loader.py:166 in <module> │
│ │
│ 165 transformers.utils.logging.tqdm = _tqdm_cls() │
│❱ 166 diffusers.pipelines.pipeline_utils.logging.tqdm = _tqdm_cls() │
│ 167 huggingface_hub._snapshot_download.hf_tqdm = _tqdm_old # pylint: disable=protected-access │
│ │
│E:\Work\LLM\sdnext-amd\venv\Lib\site-packages\diffusers\utils\import_utils.py:962 in __getattr__ │
│ │
│ 961 if name in self._modules: │
│❱ 962 value = self._get_module(name) │
│ 963 elif name in self._class_to_module.keys(): │
│ │
│E:\Work\LLM\sdnext-amd\venv\Lib\site-packages\diffusers\utils\import_utils.py:976 in _get_module │
│ │
│ 975 except Exception as e: │
│❱ 976 raise RuntimeError( │
│ 977 f"Failed to import {self.__name__}.{module_name} because of the following error (look up to see │
╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
RuntimeError: Failed to import diffusers.pipelines.pipeline_utils because of the following error (look up to see its traceback):
Failed to import diffusers.models.autoencoders.autoencoder_kl because of the following error (look up to see its traceback):
No module named 'torch._C._distributed_c10d'; 'torch._C' is not a package
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Acknowledgements
Issue Description
SD.Next refuses to start because a package cannot import diffusers.pipelines.pipeline_utils and diffusers.models.autoencoders.autoencoder_kl
This is on ROCm 6.4.4 ( w/ 9070 XT) on SD.Next dev branch.
I have run a clean installation three times and it always fails like that. Maybe an upstream diffusers issue?
Version Platform Description
08:03:59-713163 INFO Starting SD.Next
08:03:59-716766 INFO Logger: file="E:\Work\LLM\sdnext-amd\sdnext.log" level=DEBUG host="Burret-PC" size=77
mode=create
08:03:59-718313 INFO Python: version=3.12.11 platform=Windows bin="E:\Work\LLM\sdnext-amd\venv\Scripts\python.exe"
venv="E:\Work\LLM\sdnext-amd\venv"
08:03:59-984192 INFO Version: app=sd.next updated=2025-09-30 hash=0c1d34721 branch=dev
url=https://github.com/vladmandic/sdnext.git/tree/dev ui=dev
08:04:00-462704 INFO Version: app=sd.next latest=2025-09-29T23:37:58Z hash=0c1d3472 branch=dev
08:04:00-496274 INFO Platform: arch=AMD64 cpu=AMD64 Family 25 Model 33 Stepping 0, AuthenticAMD system=Windows
release=Windows-11-10.0.26100-SP0 python=3.12.11 locale=('English_Germany', '1252')
docker=False
08:04:00-497841 DEBUG Packages: prefix=venv site=['venv', 'venv\Lib\site-packages']
08:04:00-498867 INFO Args: ['--debug', '--use-rocm', '--use-nightly']
08:04:00-499899 DEBUG Setting environment tuning
08:04:00-500927 DEBUG Torch allocator: "garbage_collection_threshold:0.80,max_split_size_mb:512"
08:04:00-501440 DEBUG Install: package="gradio" install required
08:04:53-649988 INFO Verifying torch installation
08:04:53-663400 DEBUG Torch overrides: cuda=False rocm=True ipex=False directml=False openvino=False zluda=False
08:04:53-717742 INFO ROCm: AMD toolkit detected
08:04:53-718768 INFO ROCm: agents=['gfx1201']
08:04:53-719280 INFO ROCm: version=6.4, using agent gfx1201
08:04:53-720303 INFO Python: version=3.12.11 platform=Windows bin="E:\Work\LLM\sdnext-amd\venv\Scripts\python.exe"
venv="E:\Work\LLM\sdnext-amd\venv"
08:04:53-729042 DEBUG Install: package="torch" install required
08:04:53-729556 INFO Torch: download and install in progress... cmd="--no-cache-dir
https://repo.radeon.com/rocm/windows/rocm-rel-6.4.4/torch-2.8.0a0%2Bgitfc14c65-cp312-cp312-win_
amd64.whl
https://repo.radeon.com/rocm/windows/rocm-rel-6.4.4/torchvision-0.24.0a0%2Bc85f008-cp312-cp312-
win_amd64.whl"
08:07:39-147565 DEBUG Install: package="onnx" install required
08:08:01-501310 DEBUG Install: package="onnxruntime" install required
08:08:10-785659 INFO Transformers install: version=4.56.2
08:08:59-351777 INFO Diffusers install: commit=64a5187d96f9376c7cf5123db810f2d2da79d7d0
Relevant log output
Backend
Diffusers
Compute
AMD ROCm
Interface
Standard
Branch
Dev
Model
Other
Acknowledgements