# Error 10: Field Must Be Numeric

PayMe's message with `language: "en"`: **Field must be numeric**

A field that must be a number isn't. `status_additional_info` holds the value, not the field name.

## Usual causes

- `installments` that isn't a number: the sandbox answered HTTP 500 for `x`.

## What to do

- Send a number, or a string of digits such as `"1"`. Check the field on its reference page.

The full list of codes is on [Errors](/payments/getting-started/errors). If something else is going on, see [Troubleshooting by Symptom](/agents/errors/troubleshooting).