# InpaintPreprocessor node fails to load in Krita-AI-Diffusion / ComfyUI setup

[xinrimuli2333-lgtm]

When using the source version of Krita-AI-Diffusion (with ComfyUI), the InpaintPreprocessor node fails to load. The UI displays the following error:

Error: Connection established, but the server is missing required custom nodes or models!
Missing or outdated custom nodes:
• ControlNet Preprocessors https://github.com/Fannovel16/comfyui_controlnet_aux

System Environment

• OS: Windows 10, version 19045
• Python: 3.10.11 (official installer, added to PATH)
• ComfyUI: source version, directory D:\ComfyUI\ComfyUI
• Virtual environment: venv (activated)
• Plugin path: D:\ComfyUI\ComfyUI\custom_nodes\comfyui_controlnet_aux\

Installation Steps

cd D:\ComfyUI\ComfyUI
python -m venv venv
venv\Scripts\activate
pip install -r requirements.txt
pip install -r custom_nodes/comfyui_controlnet_aux/requirements.txt
python main.py
Troubleshooting / What I’ve tried

Verified that custom_nodes/comfyui_controlnet_aux exists with __init__.py and all Python files

Dependencies are installed via pip

Launching ComfyUI from the same virtual environment

Reinstalling the plugin and updating ComfyUI

Issue persists


2026-02-28 17:41:11,482 INFO Loaded 4 model files from C:\Users\JT\AppData\Roaming\krita\ai_diffusion\database\loras.json
2026-02-28 17:41:11,812 INFO Checking for latest plugin version at https://api.interstice.cloud
2026-02-28 17:41:12,950 INFO Connecting to http://127.0.0.1:8188
2026-02-28 17:41:13,407 INFO Checking for required custom nodes...
2026-02-28 17:41:13,532 ERROR Missing required node InpaintPreprocessor from package ControlNet Preprocessors (https://github.com/Fannovel16/comfyui_controlnet_aux)
2026-02-28 17:41:13,690 INFO Plugin is up to date!
2026-02-28 18:01:15,505 INFO Loaded 15 sampler presets from C:\Users\JT\AppData\Roaming\krita\pykrita\ai_diffusion\presets\samplers.json
2026-02-28 18:01:15,526 INFO Extension initialized, Version: 1.48.0, Python: 3.10.7 (tags/v3.10.7:6cc6b13, Sep  5 2022, 14:08:36) [MSC v.1933 64 bit (AMD64)]
2026-02-28 18:01:15,526 INFO Loading settings from C:\Users\JT\AppData\Roaming\krita\ai_diffusion\settings.json
2026-02-28 18:01:15,527 INFO Found server installation v1.48.0 [cuda] at D:\新建文件夹\ComfyUI
2026-02-28 18:01:15,527 INFO Loaded 4 model files from C:\Users\JT\AppData\Roaming\krita\ai_diffusion\database\loras.json
2026-02-28 18:01:15,745 INFO Checking for latest plugin version at https://api.interstice.cloud
2026-02-28 18:01:16,701 INFO Connecting to http://127.0.0.1:8188
2026-02-28 18:01:17,161 INFO Checking for required custom nodes...
2026-02-28 18:01:17,275 ERROR Missing required node InpaintPreprocessor from package ControlNet Preprocessors (https://github.com/Fannovel16/comfyui_controlnet_aux)
2026-02-28 18:01:17,362 INFO Plugin is up to date!