[solved] Unity Version Downgrade error solved 유니티 다운그레이드 성공

Successful.

'RevisionsService' does not contain a definition for 'FetchSingleRevisionCallback' and no accessible extension method

github.com/Unity-Technologies/arfoundation-samples/issues/591

[Bug] Importing the project in Unity 2019.4 gives errors · Issue #591 · Unity-Technologies/arfoundation-samples

>That is not a bug but a version mismatch indication for the Unity Collaborate Package. Go Window/package Manager/Unity Collaborate and set the Version from .7 - 4.1.0 to upgrade to 2019.x your current Unity Editor.

1. Delete Unity collaborate
Unity Collaborate 삭제하였음

\Scripts\Editor\TMP_PackageUtilities.cs(453,84): error CS0103: The name 'VersionControlSettings' does not exist in the current context

> remove the textmeshoackage if you are not using it
> TEXTPROMESH 삭제하였음

library\PackageCache\com.unity.2d.common@4.0.3\Runtime\Internal Bridge\InternalEngineBridge.cs(36,48): error CS0117: 'SpriteRendererDataAccessExtensions' does not contain a definition for 'SetBatchDeformableBufferAndLocalAABBArray'

> If someone comes across this, I was able to fix this error message by reinstalling all 2d packages in Package manager.