RunUAT ERROR: AutomationTool failed to compile.(Mac)

[link text][2]

I developed a game project and encountered this problem when I packed it. I developed it with mac. The development language is the blueprint.Please help me!

When I do this, the system will delete the /Users/Shared/Epic Games/UE_4.20/Engine/Binaries/DotNET/AutomationScripts/ folder and /Users/Shared/Epic Games/UE_4.20/Engine /Binaries/DotNET/ AutomationTool.exe file in this directory! Why?