Workflow could not be activated: External hook "workflow.activate"failed

Questions
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1

I’ve created a few workflows, and they’ve been working perfectly beforehand. However, now they are not functioning properly. I get the error message:

"Workflow could not be activated: External hook “workflow.activate"failed”

I have tried logging in and out, deleting cache. I have less than 2 workflows active so that shouldn’t be the problem.

The workflow was working fine before. I also tried copying the old workflow which was working.

Please share your workflow

Information on your n8n setup

  • 1.82.3
  • Cloud
  • Windows, Chrome
2

Even gives the same error when just using a manual trigger. Very strange.

3

The same issue appears to have been reported here. One of the comments on that ticket suggests restarting the (cloud) instance (workspace). Did you try that here?

4

This was likely a case of hitting the instance’s max active workflows limit.
If you upgrade to the latest version, the error should be clearer.

5

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