UWP .NET build error

Unity Engine
,
1

Hello.
Trying build uwp - windows 10 desktop, universal 10, PC, XAML, Local Machine.
(Unity 5.5.1 .net backend)

error:

error CS0234: The type or namespace name ‘ThreadPriority’ does not exist in the namespace ‘System.Threading’ (are you missing an assembly reference?)

here:
public System.Threading.ThreadPriority PhysicsThreadsPriority (<<<here)
{
get { return physicsThreadsPriority; }
}

What’s wrong?

2

ThreadPriority enum is not available on .NET scripting backend. It’s only available on IL2CPP when targeting UWP.

3

Thank you!