LogoWonderful Launcher
  • Home
  • Pricing
  • Docs
  • Download

How to Fix ComfyUI Manager Install Errors

Partially verified

Fix ComfyUI Manager installation failures including git clone errors, Python dependency issues, and startup failures after installing Manager.

Community Knowledge

This page is based on common ComfyUI troubleshooting patterns and has not been fully tested across all environments. Back up your environment before changing packages.

If ComfyUI Manager fails to install or causes ComfyUI to crash after installation, this guide covers the most common failure modes and their fixes.

ComfyUI Manager is the most popular custom node management tool for ComfyUI. When it fails, it blocks the easiest way to install other custom nodes — so fixing it quickly matters.

Fast answer

For a fresh install of ComfyUI Manager:

cd ComfyUI\custom_nodes
git clone https://github.com/ltdrdata/ComfyUI-Manager.git
..\..\..\python_embeded\python.exe -s -m pip install -r ComfyUI-Manager\requirements.txt

Then restart ComfyUI. If it still fails, read the startup log for the specific error.

What the errors look like

During installation

fatal: unable to access 'https://github.com/ltdrdata/ComfyUI-Manager.git/':
Could not resolve host: github.com
error: RPC failed; curl 56 Recv failure: Connection was reset

During ComfyUI startup

IMPORT FAILED: ComfyUI-Manager
ModuleNotFoundError: No module named 'aiohttp'
IMPORT FAILED: ComfyUI-Manager
ImportError: cannot import name '...' from 'packaging'

Manager UI issues

ComfyUI Manager: Failed to get custom node list

Why it happens

  • Network issues: Cannot reach GitHub to clone the repository
  • Git not installed: The git command is not available on your system
  • Requirements not installed: Manager's Python dependencies were not installed after cloning
  • Proxy or firewall: Corporate networks or VPNs block GitHub access
  • Permissions: The custom_nodes/ folder has restrictive file permissions
  • Conflicting version: An old version of Manager conflicts with a newer ComfyUI
  • Incomplete clone: The git clone was interrupted, leaving a broken folder

Step-by-step fix

Step 1: Check if git is installed

git --version

If this fails, install Git from git-scm.com. ComfyUI Manager requires git for installation and for managing other custom nodes.

Step 2: Remove any failed installation

If a previous install attempt left a broken folder:

cd ComfyUI\custom_nodes
rmdir /s /q ComfyUI-Manager

Step 3: Clone fresh

cd ComfyUI\custom_nodes
git clone https://github.com/ltdrdata/ComfyUI-Manager.git

If git clone fails with network errors:

  • Check your internet connection
  • Try using a VPN if GitHub is blocked in your region
  • Try HTTPS instead of SSH: the URL should start with https://
  • If behind a corporate proxy, configure git proxy settings

Step 4: Install requirements

This step is often skipped and causes IMPORT FAILED:

.\python_embeded\python.exe -s -m pip install -r ComfyUI\custom_nodes\ComfyUI-Manager\requirements.txt

Read the requirements file first to check it will not downgrade core packages.

Step 5: Restart ComfyUI and check the log

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

Look for IMPORT FAILED: ComfyUI-Manager in the startup log. If it still appears, the traceback will tell you which specific package is missing or conflicting.

Step 6: If Manager loads but cannot fetch node lists

If ComfyUI Manager opens but shows "Failed to get custom node list":

  • Check your internet connection — Manager needs to download the node registry
  • Try updating Manager: cd ComfyUI\custom_nodes\ComfyUI-Manager && git pull
  • Check if a firewall is blocking Manager's API calls
  • See Failed to Get Custom Node List for detailed troubleshooting

When not to run pip install blindly

  • Do not run pip install comfyui-manager — it is not a pip package. It must be git-cloned into custom_nodes/
  • Do not install Manager's requirements into a system Python — use the ComfyUI embedded Python
  • If Manager's requirements.txt conflicts with your existing packages, consider updating ComfyUI and Manager together rather than forcing one version

How Wonderful Launcher can help

Wonderful Launcher includes built-in custom node management without requiring ComfyUI Manager. If Manager fails to install, Wonderful Launcher provides an alternative way to discover, install, and update custom nodes.

Download Wonderful Launcher — it's free and provides custom node management out of the box.

Related errors

  • Deployment Failed Installing ComfyUI Manager
  • Failed to Get Custom Node List
  • ComfyUI Plugin Import Failed
  • ComfyUI Manager Guide
  • Install Custom Nodes

Source References

  • ComfyUI Manager GitHub
  • ComfyUI GitHub
  • Git for Windows

Start free with Wonderful Launcher if this affects your real ComfyUI environment. It keeps launcher-native repair, task logs, and runtime checks in one place; credits are only for image generation and metered tools.

Download Wonderful LauncherSee credit packages

Did this fix your issue?

Your answer helps prioritize verified ComfyUI repairs.

Table of Contents

What the errors look like
During installation
During ComfyUI startup
Manager UI issues
Why it happens
Step-by-step fix
Step 1: Check if git is installed
Step 2: Remove any failed installation
Step 3: Clone fresh
Step 4: Install requirements
Step 5: Restart ComfyUI and check the log
Step 6: If Manager loads but cannot fetch node lists
When not to run pip install blindly
How Wonderful Launcher can help
Related errors
Source References