How to Fix ModuleNotFoundError: No module named 'nvvfx' in ComfyUI?

The ModuleNotFoundError: No module named 'nvvfx' error is one of the most common issues ComfyUI users hit after installing the NVIDIA RTX Nodes custom node pack on Windows. The error occurs because ComfyUI's embedded Python cannot build the nvidia-vfx source package from PyPI due to a missing build backend. How to Fix Read the full guide here: https://smartart.live/articles/machine-learning/294-modulenotfounderror-no-module-named-nvvfx-fix-for-comfyui-nvidia-rtx-nodes.html