Overview

The following error may appear when sending a WhatsApp template message:

(#132000) Number of parameters does not match the expected number of params – body: number of localizable_params (0) does not match the expected number of params (1)

This error is returned by the Meta WhatsApp API when the number of variables provided in the API request does not match the number of variables defined in the approved message template.


Why This Error Occurs

WhatsApp message templates created in WhatsApp Business Manager (via Meta Business Manager) can include dynamic variables such as:

Hello {{1}}, your order has been confirmed.

In this example:

  • The template expects 1 variable ({{1}})

  • If you send the message without passing a value for {{1}}, the API receives:

    • localizable_params = 0

    • expected params = 1

  • Result: Error #132000

This mismatch between:

  • Expected parameters (defined in template)

  • Actual parameters sent in the request

causes the failure.


How to Fix

Follow these steps to resolve the issue:

1️⃣ Review the Template

Go to your WhatsApp template settings and check the message body for variables like:

{{1}}, {{2}}, {{3}}

Count the total number of placeholders.

2️⃣ Assign Variables Properly

Ensure that:

  • Each placeholder has a corresponding variable mapped

  • The correct dynamic values are passed in the message request

  • No required variable is left empty

Example:

If template body is:

Hi {{1}}, your appointment is on {{2}}.

You must send:

  • {{1}} = Customer Name

  • {{2}} = Appointment Date

|3️⃣ Save the Template

If variables were recently added or modified:

  • Click Save

  • Ensure the template is properly updated and synced


Important Notes

  • Even if a variable is optional in your workflow, it must still be supplied if defined in the template.

  • Sending an empty request without parameters will always trigger this error.

  • Template structure and API payload must strictly match.

Summary

Error #132000 occurs due to a mismatch between:

  • The number of variables defined in the WhatsApp template

  • The number of variables passed when sending the message

To resolve:
✔ Assign all required variables
✔ Verify mapping
✔ Save and sync the template

Once the parameter count matches the template definition, the message will send successfully.