I can not run/debug cpp application because of Toolchain

I'm super noob. What does it mean? I'm trying to build unit tests on x86 machine.

I have set these properties like that below. Seems that they should tell CubeIDE which toolchain it needs and automatically download appropriate ones.

I have tried to add local toolchains in Toolchain Manager: cpp or c++ from arm toolchain folder. You can see screenshot from MC. I just can not choose any configuration in CubeIDE. Or may be do I need to download some other toolchain for desktop mac cpp app?