Hello, I don't usually work on Unity, but now I'm trying to update the Unity version for a project created about a few years ago.
Currently, I updated its version to 2019.4.29f1, and I have 62 compiler errors and all of them reside under the Assets/Unity Recorder/Editor. Since the first couple errors were the same as [this thread][1], which is
> 'UIElements' does not exist in the namespace 'UnityEngine.Experimental'
So I was able to solve it by changing the
using UnityEngine.Experimental.UIElements;
to
using UnityEngine.UIElements;
however, I cannot solve the rest of the errors like,
Assets/Unity Recorder/Editor/Timeline/RecorderClip.cs(6,19): error CS0234: The type or namespace name 'Timeline' does not exist in the namespace 'UnityEngine'
Assets/Unity Recorder/Editor/Sources/RecorderItem.cs(10,26): error CS0246: The type or namespace name 'VisualElement' could not be found
Assets/Unity Recorder/Editor/Sources/RecorderItem.cs(16,18): error CS0246: The type or namespace name 'Toggle' could not be found
So my questions are
1. This sort of errors happen because I upgraded the Unity version? (if not what causes those errors, and why only under the Unity Recorder happens)
2. What could be a way to solve this "type or namespace name XYZ could not be found" error?
[1]: https://forum.unity.com/threads/uielements-namespace-does-not-exist.825102/
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