When loading the graph, the following node types were not found

The message

When loading the graph, the following node types were not found

ComfyUI frontend 1.32.0 read September 26, 2026ComfyUIcustom nodesworkflows

What it means

The workflow you opened uses node types your ComfyUI doesn't have. Usually they come from a custom node pack you haven't installed; sometimes they're core nodes newer than your ComfyUI.

What to do

Open ComfyUI-Manager and click Install Missing Custom Nodes, install what it lists, then restart. If the missing names are core nodes, update ComfyUI instead.

You drag a workflow into ComfyUI, and before anything runs you get a dialog like this, from issue #7037:

Missing Node Types
When loading the graph, the following node types were not found

SaveWEBM
WanImageToVideo

The nodes it lists show up red on the canvas, and the workflow won't run until they're fixed. We found the wording in two places: the old built-in web interface (ComfyUI 0.0.1 has it in web/scripts/app.js) and the separate ComfyUI frontend up to version 1.32.0, where the dialog is titled "Some Nodes Are Missing" and adds "This may also happen if your installed version is lower and that node type can’t be found." Frontend 1.33.0 (November 19, 2025) dropped it. ComfyUI 0.37.0 ships frontend 1.52.7, which says "This workflow has missing nodes" instead. Same problem, same fix.

Why the nodes are missing

A workflow file stores each node's type name, and ComfyUI can only draw types something on your install registered. Most shared workflows use custom node packs (add-ons in custom_nodes). If you don't have the pack, you get this. A ComfyUI contributor put it plainly in #3780: "That is a custom node you have to install separately."

The second cause is an old ComfyUI. SaveWEBM and WanImageToVideo above are core nodes, and the reply to #7037 was "You need to update ComfyUI to get those new nodes."

Install Missing Custom Nodes

ComfyUI-Manager is the add-on for installing node packs. Its README describes the button: "When you click on the Install Missing Custom Nodes button in the menu, it displays a list of extension nodes that contain nodes not currently present in the workflow." Install the packs it lists, restart ComfyUI, and reload the workflow. Recent versions label the same step "Install Missing Nodes" in the missing-nodes panel.

In ComfyUI 0.37.0 the Manager is switched on with a startup flag. The README's two steps:

pip install -r manager_requirements.txt
python main.py --enable-manager

If a pack installs and its nodes are still missing after the restart, check the startup log for (IMPORT FAILED) next to that pack. It's installed but broke while loading, usually over a missing Python package.

When the Manager can't find them

The Manager lists nothing for a name: ltdrdata, a ComfyUI maintainer, answered one such case with "That's an unknown custom node. You need to inquire with the workflow creator." The pack isn't in the Manager's database, so ask whoever shared the workflow where it came from.
The node was retired: IPAdapterApply is one. ltdrdata's reply in #3314 was "That is deprecated node. But you can install it from Legacy channel in ComfyUI-Manager."
They're core nodes and you've updated: a ComfyUI team member in #10490 said to make sure comfyui-frontend-package is the version pinned in ComfyUI's requirements.txt, since the interface updates separately.

Other lines the same feature prints

Match yours against these if the one at the top of the page is not quite it. They come from the same code and mean related things.

When loading the graph, the following node types were not found:
Some Nodes Are Missing
Missing Node Types
This may also happen if your installed version is lower and that node type can’t be found.
Nodes that have failed to load will show as red on the graph.
This workflow has missing nodes