> ## Documentation Index
> Fetch the complete documentation index at: https://tempolabsinc.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Websocket/Hot Reload Error

> If you see a websocket or hot reload error when you load your app in Tempo use this guide to fix the problem.

If you are using `Vite` this is likely because you have a custom hmr configuration. E.g. in vite.config.js:

```
  server: {
    hmr: {
      host: "localhost",
      port: 3050,
      clientPort: 3050,
    },
  },
```

Change this to use the default if in tempo:

```
server: {
    hmr: {
      host: import.meta.env.TEMPO ? undefined : "localhost",
      port: import.meta.env.TEMPO ? undefined : 3050,
      clientPort: import.meta.env.TEMPO ? undefined : 3050,
    },
  },
```