# Troubleshooting WhatsApp API Error 131009: Parameter Value Is Not Valid
Author: Prashant Jangid
Author URL: https://www.heltar.com/blogs/author/prashant-jangid
Published: 2025-01-02
Category: Troubleshoot
Category URL: https://www.heltar.com/blogs/category/troubleshoot
Tags: Whatsapp Business API
Tag URLs: Whatsapp Business API (https://www.heltar.com/blogs/tag/whatsapp-business-api)
URL: https://www.heltar.com/blogs/troubleshooting-whatsapp-api-error-131009-parameter-value-is-not-valid-cm5fbz31x000ckg77rnoen8g3

When using the WhatsApp Business API, error code 131009 with the message "Parameter value is not valid" indicates that one or more of the values in your API request parameters are incorrect. This blog explains why this error occurs and how to fix it.

## When Does Error 131009 Occur?

This error happens when:

1. The values you’ve provided for one or more parameters do not meet the expected format or requirements.

2. The phone number used in the request has not been added to your WhatsApp Business Account.


## **How to Fix Error 131009?**

### **1\. Check the API Endpoint Reference**

Visit the [official WhatsApp API documentation for the endpoint](https://developers.facebook.com/docs/whatsapp/cloud-api/reference) you are using and verify that each parameter in your request has a valid and correct value.

## 2\. Verify Phone Numbers

Confirm that the phone number in your request has been added to your WhatsApp Business Account.

To add a phone number:

- Open **WhatsApp Business Manager**. Check steps to open WhatsApp Manager [here](https://www.heltar.com/blogs/how-to-access-whatsapp-manager-on-meta-business-manager-cm58dt4sr001sx9tqqhi8rmgo).

- In the left menu, click **Phone Numbers** and select **Add Phone Number**.

- Provide your WhatsApp Business display name and category, then click **Next**.

- Input your phone number, choose a verification method, and enter the verification code.

- Add the verified number to your phone number list.


By reviewing your parameters and making necessary adjustments, you can resolve this error and ensure your messages are sent successfully. For more troubleshooting tips check out [heltar.com/blogs](https://heltar.com/blogs).


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