runtime error

no module 'xformers'. Processing without... no module 'xformers'. Processing without... Traceback (most recent call last): File "/home/user/app/webui.py", line 54, in <module> from modules.call_queue import wrap_gradio_gpu_call, wrap_queued_call, queue_lock # noqa: F401 File "/home/user/app/modules/call_queue.py", line 6, in <module> from modules import shared, progress, errors File "/home/user/app/modules/shared.py", line 21, in <module> from ldm.models.diffusion.ddpm import LatentDiffusion File "/home/user/app/repositories/stable-diffusion-stability-ai/ldm/models/diffusion/ddpm.py", line 20, in <module> from pytorch_lightning.utilities.distributed import rank_zero_only ModuleNotFoundError: No module named 'pytorch_lightning.utilities.distributed'

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