Hello I am trying to make a custom Function and return availability to VAPI but I keep getting this error: I also included my respond webhook as well. any ideas ? https://cdn.discordapp.com/attachments/1437110738987782295/1437110739255951401/01K9MND5DBY9PZHMR2G2G5A4JP.png?ex=693c3d2c&is=693aebac&hm=bf13ab098b1d954f729eb11dcb3b07b40844e8b520b721ddffb727a0f0b852c0& https://cdn.discordapp.com/attachments/1437110738987782295/1437110739683905627/image.png?ex=693c3d2c&is=693aebac&hm=7a05f530c26cea632ad855593340128425dce014ea325fdb531117bf1c060295&

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Thanks for sharing the details! Based on the error and your description, a common cause is returning a JSON object (not a string) in the

result

field of your webhook response. Could you confirm: Are you returning the

result

as a single-line string (not an object or array) in your

results

array, like this?

json
{
  "results": [
    {
      "toolCallId": "call_casKyF5DieBITQ3MAMHH",
      "result": "Your availability details as a single-line string"
    }
  ]
}

If not, updating your response to match this format should resolve the "No result returned" error. [See troubleshooting guide](https://docs.vapi.ai/tools/custom-tools-troubleshooting#no-result-returned-error) Source: - [Custom tools troubleshooting](https://docs.vapi.ai/tools/custom-tools-troubleshooting)

Hi Чебурашка, How can I assist you today with your Vapi setup or integration? If you have any issues or questions, feel free to share the details. I’m here to help.