FBX Exporter "Unable to resolve reference 'UnityEngine.Timeline' Error

Hello everyone,

i want to use the FBX Exporter in Unity, so i imported the latest version into the latest Unity version.
I’ll get the error message:

****** Assembly ‘Assets/FbxExporters/Editor/UnityFbxExporterEditor.dll’ will not be loaded due to errors:
Unable to resolve reference ‘UnityEngine.Timeline’. Is the assembly missing or incompatible with the current platform? Reference validation can be disabled in the Plugin Inspector.

Can someone tell me what i need to fix? I dont use unity at all and only need to convert some prefab files into FBX.

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I’m seeing the same now. Only FBX Exporter 1.2.0f1 shows up in Package Manager.
Unity 2020.1.15f1