Reproduced on 5.0.0f1, 5.0.0f4;

Repro steps:
1. open project "AsUnityAnalytics.zip";
2. try to build to WSA (8.1 or phone 8.1) platform;
3. errors occur in the console:

Reference Rewriter: Error: type `System.ApplicationException` doesn't exist in target framework. It is referenced from UnityEngine.Cloud.Analytics.dll at System.Void UnityEngine.Cloud.Analytics.TestWWW::setResponse(System.Int32,System.String,System.Byte[],System.String,System.Collections.Generic.Dictionary`2<System.String,System.String>).

UnityEngine.Debug:LogError(Object)
PostProcessMetroPlayer:RunReferenceRewriter(WSASDK, String, String, String, String) (at C:/buildslave/unity/build/PlatformDependent/MetroPlayer/Extensions/Managed/PostProcessMetroPlayer.cs:334)
MetroPlugin:RunReferenceRewriter(String, String, String) (at C:/buildslave/unity/build/PlatformDependent/MetroPlayer/Extensions/Managed/MetroPlugin.cs:148)
PostProcessMetroPlayer:PostProcessSDKSpecific(WSASDK, BuildTarget, BuildOptions, String, String, ProjectImages, LibraryCollection) (at C:/buildslave/unity/build/PlatformDependent/MetroPlayer/Extensions/Managed/PostProcessMetroPlayer.cs:890)
PostProcessMetroPlayer:PostProcess(BuildTarget, BuildOptions, String, String, String, String) (at C:/buildslave/unity/build/PlatformDependent/MetroPlayer/Extensions/Managed/PostProcessMetroPlayer.cs:597)
UnityEditor.BuildPlayerWindow:BuildPlayerAndRun()