我已创建一个PCL项目，随时随地，我试图从的NuGet添加引用我有这样的错误：（与所有包发生这个错误）PCL便携式不支持用的NuGet
Could not install package 'Microsoft.Bcl.Build 1.0.13'. You are trying to install this package into a project that targets 'portable-Unsupported', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author. System.InvalidOperationException: Could not install package 'Microsoft.Bcl.Build 1.0.13'. You are trying to install this package into a project that targets 'portable-Unsupported', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author. at NuGet.ProjectManager.ExtractPackageFilesToProject (IPackage package) [0x00000] in :0 at NuGet.ProjectManager.AddPackageReferenceToProject (IPackage package) [0x00000] in :0 at NuGet.ProjectManager.Execute (NuGet.PackageOperation operation) [0x00000] in :0
at NuGet.ProjectManager.Execute (IPackage package, IPackageOperationResolver resolver) [0x00000] in :0 at NuGet.ProjectManager.AddPackageReference (IPackage package, Boolean ignoreDependencies, Boolean allowPrereleaseVersions) [0x00000] in :0 at NuGet.ProjectManager.AddPackageReference (System.String packageId, NuGet.SemanticVersion version, Boolean ignoreDependencies, Boolean allowPrereleaseVersions) [0x00000] in :0 at ICSharpCode.PackageManagement.SharpDevelopPackageManager.AddPackageReference (IPackage package, Boolean ignoreDependencies, Boolean allowPrereleaseVersions) [0x00000] in :0 at ICSharpCode.PackageManagement.SharpDevelopPackageManager.InstallPackage (IPackage package, ICSharpCode.PackageManagement.InstallPackageAction installAction) [0x00000] in :0 at ICSharpCode.PackageManagement.PackageManagementProject.InstallPackage (IPackage package, ICSharpCode.PackageManagement.InstallPackageAction installAction) [0x00000] in :0 at ICSharpCode.PackageManagement.InstallPackageAction.ExecuteCore() [0x00000] in :0 at ICSharpCode.PackageManagement.ProcessPackageAction.Execute() [0x00000] in :0 at ICSharpCode.PackageManagement.PackageActionRunner.Run (IPackageAction action) [0x00000] in :0 at ICSharpCode.PackageManagement.PackageViewModel.InstallPackage (IEnumerable`1 packageOperations) [0x00000] in :0
at ICSharpCode.PackageManagement.PackageViewModel.InstallPackage() [0x00000] in :0 at ICSharpCode.PackageManagement.PackageViewModel.TryInstallingPackage()[0x00000] in :0
那些信息我环境
=== Xamarin Studio ===
Version 4.2.2 (build 2)
Runtime:
Mono 3.2.5 ((no/964e8f0)
GTK+ 2.24.20 theme: Raleigh
GTK# (2.12.0.0)
Package version: 302050000
=== Xamarin.Android ===
Version: 4.10.1 (Business Edition)
Android SDK: /Users/luigisaggese/Library/Developer/Xamarin/android-sdk-mac_x86
Supported Android versions:
1.6 (API level 4)
2.1 (API level 7)
2.2 (API level 8)
2.3 (API level 10)
3.1 (API level 12)
3.2 (API level 13)
4.0 (API level 14)
4.0.3 (API level 15)
4.1 (API level 16)
4.2 (API level 17)
Java SDK: /usr
java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)
=== Apple Developer Tools ===
Xcode 5.0.2 (3335.32)
=== Xamarin.iOS ===
Version: 7.0.5.2 (Business Edition)
Build date: 2013-02-12 20:04:08-0500
=== Xamarin.Mac ===
Xamarin.Mac: Not Installed
=== Operating System ===
Mac OS X 10.8.5