> For the complete documentation index, see [llms.txt](https://docs.blockend.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.blockend.com/troubleshooting/react-issues.md).

# React issues

## 1. RPC websocket

```
Class extends value /static/media/client.98866d6736d9f36d61b8.cjs is not a constructor or null
TypeError: Class extends value /static/media/client.98866d6736d9f36d61b8.cjs is not a constructor or null
```

If you encounter the above error, add this code to your package.json file

```
"resolutions": {
    "rpc-websockets": "7.10.0",
    "@solana/web3.js": "1.91.6"
}
```

for more details please refer <https://docs.dynamic.xyz/troubleshooting/react/cannot-resolve-rpc-websockets>