augmented reality – Unity 2019 Error : com.unity.xr.arsubsystems@2.2.0-preview.3/Runtime/ImageTrackingSubsystem/XRImageTrackingSubsystem.cs57,30): error CS0506:

I am opening an old project created in 2019.3 inside my new Unity 2019.4. I got this error message in Unity Console:

Library/PackageCache/com.unity.xr.arsubsystems@2.2.0-preview.3/Runtime/ImageTrackingSubsystem/XRImageTrackingSubsystem.cs(57,30): error CS0506: ‘XRImageTrackingSubsystem.Destroy()’: cannot override inherited member ‘Subsystem.Destroy()’ because it is not marked virtual, abstract, or override

==========

Please note that this current project does not use anything related to AR “Augmented Reality” or XR package.

Also, I have already googled this error message, but have not seen a solution yet.

However, I guess that this error likely comes from some conflicts in the AR or XR versions.

To fix this error, should I install or update the basic Unity XR or AR package ?

Thank you very much.