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Unity Bulid Assembly Error

Hello.
The game is being developed.
Unity 2017.2.0.0p2 and Visual Studio 2017 ver 15.4.4 and .Net 4.7.02556
The Unity editor plays well.
But Bulid Error .
r.cs(762,9): error CS0246: The type or namespace name 'RijndaelManaged' could not be found (are you missing a using directive or an assembly reference?)
Assets\SteamVR\Plugins\openvr_api.cs(1640,49): error CS0234: The type or namespace name 'PlatformID' does not exist in the namespace 'System' (are you missing an assembly reference?)
UnityEditor.BuildPlayerWindow+BuildMethodException: 90 errors
at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (BuildPlayerOptions options) [0x00207] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:172
at UnityEditor.BuildPlayerWindow.CallBuildMethods (Boolean askForBuildLocation, BuildOptions defaultBuildOptions) [0x00050] in C:\buildslave\unity\build\Editor\Mono\BuildPlayerWindowBuildMethods.cs:83
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)
Is there any solution?
For your information
My computer has a different version of Unity and a visual studio as well as a visual studio 2015.
Answers
Are you using a dll? And is that dll set to be compiled with Windows Store and x86? And does that dll support UWP?
Taqtile
@mark_grossnickle
Set UWP
You are referencing a library that isn't supported in 4.5:
https://stackoverflow.com/questions/35912849/rijndael-in-class-library-package-not-available-for-dotnet5-4
I assume that is because the SteamVR plugin may not support UWP?
Taqtile