---
title: 500 error when starting the API Explorer
source: https://docs.newrelic.com/docs/apis/rest-api-v2/troubleshooting/500-error-when-starting-api-explorer
---

## Problem

A `500` error appears when starting the API Explorer.

## Solution

To correct this, make sure you have a default account:

1.  Go to **[one.newrelic.com > All capabilities](https://one.newrelic.com/all-capabilities) > ([user menu](https://docs.newrelic.com/docs/accounts/accounts-billing/general-account-settings/intro-account-settings)) > User preferences**.
2.  From the **Default account** dropdown, select your choice, then save.

## Cause

This occurs when you do not have a current or valid default New Relic account associated with your login. This keeps the Explorer from displaying the API keys available to you.