# Errors loading workflow due to missing extensions: Extension: AF Utility Nodes Nodes

**URL:** <https://forum.knime.com/t/errors-loading-workflow-due-to-missing-extensions-extension-af-utility-nodes-nodes/91614>\
**Category:** KNIME Business Hub\
**Created:** [March 12, 2026, 8:02pm UTC](https://forum.knime.com/t/errors-loading-workflow-due-to-missing-extensions-extension-af-utility-nodes-nodes/91614 "2026-03-12T20:02:27Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![rdcoel67](https://forum-cdn.knime.com/letter_avatar_proxy/v4/letter/r/47e85d/32.png) [@rdcoel67](https://forum.knime.com/u/rdcoel67)\
**Post date:** [March 12, 2026, 8:02pm UTC](https://forum.knime.com/t/errors-loading-workflow-due-to-missing-extensions-extension-af-utility-nodes-nodes/91614/1 "2026-03-12T20:02:27Z")

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I started using Business Hub, I already uploaded a workflow, but when I run this I get this error message:

_ **Ad-hoc run failed.** _

_Could not load workflow 'workflow\_name’ for job ‘677839a5-f8cc-42f7-9a15-3015ba1a5679’: Errors loading workflow 'workflow\_name ’ due to missing extensions: Extension: AF Utility Nodes Nodes: Regex Substring_

 ![image](https://forum-cdn.knime.com/uploads/default/original/3X/f/3/f39f9d251a65909f7f34bd410582743e59bdf5fa.png)

Do I need to install this extension in KNIME Business Hub? I can’t find a way to do so. This workflow runs ok locally. I have KNIME 5.8 version.

Regards,

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**Author:** ![sjporter](https://forum-cdn.knime.com/user_avatar/forum.knime.com/sjporter/32/33442_2.png) [@sjporter](https://forum.knime.com/u/sjporter)\
**Post date:** [March 13, 2026, 4:37pm UTC](https://forum.knime.com/t/errors-loading-workflow-due-to-missing-extensions-extension-af-utility-nodes-nodes/91614/2 "2026-03-13T16:37:56Z")

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Hey @rdcoel67,

Yes, the extension needs to be installed in the image used for the Execution Context you’re using. You (or the cluster administrator) can check out these docs to get started:

- 
### [Build a custom Dockerfile using the Executor Image Manager data app](https://docs.knime.com/hub/latest/business_hub_admin_guide/#build-a-custom-dockerfile-using-the-executor-image-manager-data-app)
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### [Add extensions to an existing Docker image](https://docs.knime.com/hub/latest/business_hub_admin_guide/#add-extensions-to-an-existing-docker-image)
- 
### [Docker executor images](https://docs.knime.com/hub/latest/business_hub_admin_guide/?pk_vid=9903428a097048471773420016fe6ebf#docker-executor-images)

Cheers,

@sjporter

_ **p.s. — welcome to the KNIME community 🙂** _

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**Author:** ![system](https://forum-cdn.knime.com/uploads/default/original/1X/ab3ccf34482a0329361734a18199390177204f15.png) [@system](https://forum.knime.com/u/system)\
**Post date:** [March 20, 2026, 4:38pm UTC](https://forum.knime.com/t/errors-loading-workflow-due-to-missing-extensions-extension-af-utility-nodes-nodes/91614/3 "2026-03-20T16:38:35Z")

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