Compilation error on MAC with UE4.8

Development Platform & Builds
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1

Hi.
I just upgraded to UE4.8.1 and I am getting the following errors when trying to compile in xcode.

Ln: lib/mono/4.5/System.Reactive.Core.dll: File exists
Ln: lib/mono/4.5/System.Reactive.Debugger.dll: File exists
Ln: lib/mono/4.5/System.Reactive.Experimental.dll: File exists
Ln: lib/mono/4.5/System.Reactive.Linq.dll: File exists
Ln: lib/mono/4.5/System.Reactive.PlatformServices.dll: File exists
Ln: lib/mono/4.5/System.Reactive.Providers.dll: File exists
Ln: lib/mono/4.5/System.Reactive.Runtime.Remoting.dll: File exists
Ln: lib/mono/4.5/System.Windows.Forms.DataVisualization.dll: File exists

I am able to start the engine fine but the above errors show up in the build log. Is there anyway to get rid of these?

2

Same with checking out 4.9.2-release on my Mac.

3

I still have the same error with v4.9. It runs even though there is a compilation error.

But it is blocking me from creating a new project. Any help on this?

4

Getting this in 4.15 on my branch. Don’t think I saw it without branching.

Any clues on what I did wrong?