Build sdk phone 8.1 not working!

i build my game with sdk phone 8.1 but error when build:
ArgumentException: The Assembly mscorlib.Extensions is referenced by FacebookWinPhone8 (‘Assets/Plugins/WSA/FacebookWinPhone8.dll’). But the dll is not allowed to be included or could not be found.
UnityEditor.AssemblyHelper.AddReferencedAssembliesRecurse (System.String assemblyPath, System.Collections.Generic.List1 alreadyFoundAssemblies, System.String[ ] allAssemblyPaths, System.String[ ] foldersToSearch, System.Collections.Generic.Dictionary2 cache, BuildTarget target) (at C:/buildslave/unity/build/Editor/Mono/AssemblyHelper.cs:156)
UnityEditor.AssemblyHelper.FindAssembliesReferencedBy (System.String[ ] paths, System.String[ ] foldersToSearch, BuildTarget target) (at C:/buildslave/unity/build/Editor/Mono/AssemblyHelper.cs:194)
UnityEditor.HostView:OnGUI()

Please help me!

Looks like that plugin is not compatible with Windows Phone 8.1, just Windows Phone 8.0.

Severity Code Description Project File Line Suppression State
Error Cannot find type System.Security.Cryptography.SymmetricAlgorithm in module mscorlib.dll. New Unity Project

@Tautvydas-Zilys When i build in VS 2015 for Windows Phone 8.1 with unity compass, I get error
Severity Code Description Project File Line Suppression State
Error Cannot find type System.Security.Cryptography.SymmetricAlgorithm in module mscorlib.dll

Looks like something is using “SymmetricAlgorithm” in your project?

i’m not using that, may be in dll, how do i solve?

When you build your project in Unity, it will print all the usages of unavailable types and methods in the console. It will also tell you which DLL, type and method is using it.

For this to work though, the DLLs must not be marked as “Don’t process”.

Let me try, thank for your help

if not be marked as “Don’t process” it not work, i can’t build project, please help me!

if not be marked as “Don’t process” it not work, i can’t build project, please help me!

Could you be more specific? What doesn’t work?