ModuleNotFoundError: No module named 'einops' in ComfyUI

If ComfyUI logs ModuleNotFoundError: No module named 'einops', install the Python package einops in the environment that starts ComfyUI.

einops is a common tensor manipulation dependency used by ComfyUI itself and many model or video custom nodes. In a broken portable environment, it often appears after core packages such as Torch, safetensors, packaging, and NumPy have been repaired.

In the SEO Lab portable repair chain, installing einops exposed the next missing package, psutil, which confirmed the startup repair was moving forward one blocker at a time.

.\python_embeded\python.exe -s -m pip show einops
.\python_embeded\python.exe -s -m pip install einops
.\python_embeded\python.exe -s -c "import einops; print('import ok')"
.\python_embeded\python.exe -s ComfyUI\main.py --windows-standalone-build

What The Log Looks Like

ModuleNotFoundError: No module named 'einops'

The traceback may appear from ComfyUI core modules, model code, or custom nodes that use tensor rearrangement helpers.

Quick Diagnosis

Step 1: Check The Active Python

Windows portable:

.\python_embeded\python.exe -s -c "import sys; print(sys.executable)"
.\python_embeded\python.exe -s -m pip show einops

Manual venv:

python -c "import sys; print(sys.executable)"
python -m pip show einops

Step 2: Install And Verify

Windows portable:

.\python_embeded\python.exe -s -m pip install einops
.\python_embeded\python.exe -s -c "import einops; print(einops.__version__)"

Manual venv:

python -m pip install einops
python -c "import einops; print(einops.__version__)"

Step 3: Restart ComfyUI

.\python_embeded\python.exe -s ComfyUI\main.py --windows-standalone-build

If a new missing package appears, continue with the new first traceback. Do not batch-install unrelated ML packages unless you are intentionally rebuilding the environment.

What Not To Do

• do not assume einops missing means the workflow file is broken
• do not install into system Python when ComfyUI starts from python_embeded
• do not downgrade Torch or NumPy just because einops is missing
• do not run every custom node requirements.txt if the traceback points to core startup

Related Guides

• Repair ComfyUI Portable Dependencies One Missing Module At A Time
• No module named 'safetensors' in ComfyUI
• No module named 'scipy' in ComfyUI
• Fix No module named errors in ComfyUI
• ComfyUI Dependency Conflicts

Source References

• Windows portable SEO Lab repair, May 18, 2026: ModuleNotFoundError: No module named 'einops' appeared after NumPy repair
• Same lab ComfyUI\requirements.txt: einops
• einops on PyPI