fix: improve error message when node type is missing#12194
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comfyanonymous merged 1 commit intomasterfrom Feb 1, 2026
Merged
fix: improve error message when node type is missing#12194comfyanonymous merged 1 commit intomasterfrom
comfyanonymous merged 1 commit intomasterfrom
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- Change error type from 'invalid_prompt' to 'missing_node_type' for frontend detection - Add extra_info with node_id, class_type, and node_title (from _meta.title) - Improve user-facing message: 'Node X not found. The custom node may not be installed.' Fixes COM-12528 Co-authored-by: Amp <amp@ampcode.com> Amp-Thread-ID: https://ampcode.com/threads/T-019c0df1-aa57-72e0-8193-46aa24b5a327
christian-byrne
requested review from
Kosinkadink,
comfyanonymous and
guill
as code owners
simonri
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this pull request
Feb 2, 2026
- Change error type from 'invalid_prompt' to 'missing_node_type' for frontend detection - Add extra_info with node_id, class_type, and node_title (from _meta.title) - Improve user-facing message: 'Node X not found. The custom node may not be installed.'
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Background
Currently, users (especially new users or users who don't know about custom nodes) will often execute workflows they got from someone else that contain nodes they do not have installed. The error message they receive is very technical and doesn't really convey what the underlying problem most likely is. This PR addresses the issue by adding a specific error type so the frontend can open a dialog with guided resolution steps (using existing dialog for "missing nodes error"). It also improves the error message content for people using other frontends, headless, or who have not updated their frontend.
Here is a list of all issues I could find where the user got the current error message and didn't understand how to resolve the issue (and/or believed it was an actual bug in ComfyUI):