The type or namespace name 'UnityEngine' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'UnityEngine' could not be found (are you missing a using directive or an assembly reference?)

Process completed with exit code 1.

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/checkout@v3, actions/setup-dotnet@v3. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

For projects targeting .NET 8.0 and higher, specifying a RuntimeIdentifier will no longer produce a self contained app by default. To continue building self-contained apps, set the SelfContained property to true or use the --self-contained argument.