Respond to webhook not working properly

Questions
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Describe the problem/error/question

Respond to webhook is not working. I am trying to get retell Ai to say a phrase after the workflow reaches the respond to webhook node and nothing happens.

What is the error message (if any)?

Can see this error message in retell: Error: Invalid webhook response format at triggerIncomingCallWebhook (file:///usr/src/app/dist/api/call_api.js:408:19) at process.processTicksAndRejections (node:internal/process/task_queues:95:5) at async file:///usr/src/app/dist/api/call_api.js:674:41

Please share your workflow

Share the output returned by the last node

Information on your n8n setup

  • n8n version:
  • Database (default: SQLite):
  • n8n EXECUTIONS_PROCESS setting (default: own, main):
  • Running n8n via (Docker, npm, n8n cloud, desktop app):
  • Operating system:
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