❗The type or namespace name 'Newtonsoft' could not be found

Cause The automatic installation of the required packages has failed. This may happen in some Unity environments due to asset import issues, missing dependencies, or project-specific conflicts.

In particular, you may encounter the following error:

❗ The type or namespace name 'Cysharp.UniTask' could not be found

This means the UniTask library by Cysharp—which provides lightweight asynchronous operations in Unity—is missing or not properly installed.

Solution

To resolve these issues, please install the missing libraries manually by following the official setup guides:

1. Newtonsoft.Json 👉 Manual Installation Guide
2. Cysharp.UniTask 👉 Manual Installation Guide

Each guide provides step-by-step instructions for adding the packages to your Unity project and verifying that everything is set up correctly. After completing the installations, restart Unity to ensure the changes take effect.