title: Failed to install Visual Studio for Mac Preview on macOS Sierra
body: <p>On <strong>macOS Sierra 10.12.2</strong> the Visual Studio for Mac Preview fails to install. The install version is <strong>3.0.0.</strong> (1).</p>
  
  <p>The software requirements are all installed, but the installer fails to detect the Android SDK at some point:</p>
  
  <pre><code>[2017-01-12 10:08:52.260] [Debug] Detecting software item 'Mono Framework'
  [2017-01-12 10:08:52.260] [Info] Checking whether Mono needs update/installation
  [2017-01-12 10:08:52.260] [Debug] In IsCurrentMonoNewEnough
  [2017-01-12 10:08:52.260] [Debug] current == /Library/Frameworks/Mono.framework/Versions/Current
  [2017-01-12 10:08:52.260] [Debug] current symlink: /Library/Frameworks/Mono.framework/Versions/4.6.2
  [2017-01-12 10:08:52.260] [Debug] file name: 4.6.2
  [2017-01-12 10:08:52.261] [Debug] parsed version: 4.6.2
  [2017-01-12 10:08:52.261] [Info] Mono 4.8.0 needs to be installed.
  [2017-01-12 10:08:52.362] [Info] Status: successful
  [2017-01-12 10:08:52.362] [Info] Software item 'Mono Framework': not up to date
  [2017-01-12 10:08:52.368] [Info] Component 'Mono Framework' v. 4.8.0 absent
  [2017-01-12 10:08:52.369] [Debug] Component Mono Framework enqueuing URL https://dl.xamarin.com/MonoFrameworkMDK/Macx86/MonoFramework-MDK-4.8.0.344.macos10.xamarin.universal.pkg
  [2017-01-12 10:08:53.506] [Debug] Detecting software item 'Java SDK'
  [2017-01-12 10:08:53.507] [Info] Checking whether Oracle JDK needs update/installation
  [2017-01-12 10:08:53.509] [Info] Status: successful
  [2017-01-12 10:08:53.509] [Info] Component 'Java SDK' v. 1.8.0 1.8.0 present
  [2017-01-12 10:08:53.509] [Info] Software item 'Java SDK': up to date
  [2017-01-12 10:08:53.509] [Debug] Detecting software item 'Android SDK'
  [2017-01-12 10:08:53.509] [Info] Checking if Android SDK needs to be updated/installed
  [2017-01-12 10:08:53.510] [Info] Using default samples:
  [2017-01-12 10:08:53.510] [Info] Downloading from 'http://download.xamarin.com/Installer/xamarin-android-sdk.xml'.
  [2017-01-12 10:08:53.510] [Debug] Setting download timeout for 'http://download.xamarin.com/Installer/xamarin-android-sdk.xml' to 60s
  [2017-01-12 10:08:54.229] [Warning] Cannot map element 'lldb' to descriptor type.
  [2017-01-12 10:08:54.229] [Warning] Cannot map element 'lldb' to descriptor type.
  [2017-01-12 10:08:54.231] [Warning] Cannot map element 'lldb' to descriptor type.
  [2017-01-12 10:08:54.231] [Warning] Cannot map element 'lldb' to descriptor type.
  [2017-01-12 10:08:54.232] [Warning] Cannot map element 'licenses' to descriptor type.
  [2017-01-12 10:08:54.433] [Debug] Detecting Android SDK in '/Users/loretoparisi/Library/Developer/Xamarin/android-sdk-macosx'
  [2017-01-12 10:08:54.538] [Debug] Download size for 'http://dl-ssl.google.com/android/repository/android-ndk-r13b-darwin-x86_64.zip': 665967997
  [2017-01-12 10:08:54.538] [Debug] NDK found in '/Users/loretoparisi/Library/Developer/Xamarin/android-ndk/android-ndk-r13b', no update necessary
  [2017-01-12 10:08:54.538] [Error] Failed to find archive for component 'system-image---default'. Tried any:any:64, any:any:0
  [2017-01-12 10:08:54.538] [Error] Android component 'system-image-23-armeabi-v7a-default': archive for OS any and architecture any not found in the manifest
  [2017-01-12 10:08:54.538] [Exception] Attempt to initialize component 'system-image-23-armeabi-v7a-default' failed
  [2017-01-12 10:08:54.538] [Exception] System.InvalidOperationException: No suitable component archive found.
  [2017-01-12 10:08:54.538] [Exception] at Xamarin.Installer.AndroidSDK.AndroidComponentBase.Init (Xamarin.Installer.AndroidSDK.AndroidComponentDescriptorBase descriptor, System.Uri repositoryUrl) [0x0011f] in /Users/builder/data/lanes/4029/b49471af/source/installer/Xamarin.Installer.AndroidSDK/Xamarin.Installer.AndroidSDK/AndroidComponentBase.cs:299
  [2017-01-12 10:08:54.538] [Exception] at Xamarin.Installer.AndroidSDK.AndroidComponentSystemImage.Init (Xamarin.Installer.AndroidSDK.AndroidComponentDescriptorBase descriptor, System.Uri repositoryUrl) [0x00000] in /Users/builder/data/lanes/4029/b49471af/source/installer/Xamarin.Installer.AndroidSDK/Xamarin.Installer.AndroidSDK/AndroidComponentSystemImage.cs:36
  [2017-01-12 10:08:54.538] [Exception] at Xamarin.Installer.AndroidSDK.AndroidComponentDescriptorBase.CreateComponent (System.String baseDownloadUrl, Xamarin.Installer.AndroidSDK.AndroidSDKInstaller installer) [0x00075] in /Users/builder/data/lanes/4029/b49471af/source/installer/Xamarin.Installer.AndroidSDK/Xamarin.Installer.AndroidSDK/AndroidComponentDescriptorBase.cs:196
  [2017-01-12 10:08:54.538] [Info] Status: failed.
  [2017-01-12 10:08:54.538] [Exception] Failed to detect component 'Android SDK'
  [2017-01-12 10:08:54.538] [Exception] System.InvalidOperationException: No suitable component archive found.
  [2017-01-12 10:08:54.538] [Exception] at Xamarin.Installer.AndroidSDK.AndroidComponentBase.Init (Xamarin.Installer.AndroidSDK.AndroidComponentDescriptorBase descriptor, System.Uri repositoryUrl) [0x0011f] in /Users/builder/data/lanes/4029/b49471af/source/installer/Xamarin.Installer.AndroidSDK/Xamarin.Installer.AndroidSDK/AndroidComponentBase.cs:299
  </code></pre>
  
  <p>Looking at logs it seems that that the Android SDK and NKD are firstly detected in the default folder, but then something fails.</p>
  
  <p>I have both Xamarin Studio Community Edition installed and Android Studio installed, so all required components should be satisfied.</p>
  
  <p>The error log continues</p>
  
  <pre><code>[2017-01-12 10:08:54.538] [Exception] Failed to detect component 'Android SDK'
  [2017-01-12 10:08:54.538] [Exception] System.InvalidOperationException: No suitable component archive found.
  [2017-01-12 10:08:54.538] [Exception] at Xamarin.Installer.AndroidSDK.AndroidComponentBase.Init (Xamarin.Installer.AndroidSDK.AndroidComponentDescriptorBase descriptor, System.Uri repositoryUrl) [0x0011f] in /Users/builder/data/lanes/4029/b49471af/source/installer/Xamarin.Installer.AndroidSDK/Xamarin.Installer.AndroidSDK/AndroidComponentBase.cs:299
  [2017-01-12 10:08:54.538] [Exception] at Xamarin.Installer.AndroidSDK.AndroidComponentSystemImage.Init (Xamarin.Installer.AndroidSDK.AndroidComponentDescriptorBase descriptor, System.Uri repositoryUrl) [0x00000] in /Users/builder/data/lanes/4029/b49471af/source/installer/Xamarin.Installer.AndroidSDK/Xamarin.Installer.AndroidSDK/AndroidComponentSystemImage.cs:36
  [2017-01-12 10:08:54.538] [Exception] at Xamarin.Installer.AndroidSDK.AndroidComponentDescriptorBase.CreateComponent (System.String baseDownloadUrl, Xamarin.Installer.AndroidSDK.AndroidSDKInstaller installer) [0x00075] in /Users/builder/data/lanes/4029/b49471af/source/installer/Xamarin.Installer.AndroidSDK/Xamarin.Installer.AndroidSDK/AndroidComponentDescriptorBase.cs:196
  [2017-01-12 10:08:54.538] [Exception] Detection failed for task Android SDK.
  [2017-01-12 10:08:54.538] [Exception] System.InvalidOperationException: No suitable component archive found.
  [2017-01-12 10:08:54.538] [Exception] at Xamarin.Web.Installer.TasksManager.DetectComponents () [0x00097] in /Users/builder/data/lanes/4029/b49471af/source/installer/Xamarin.Web.Installer/TasksManager.cs:297
  [2017-01-12 10:08:54.539] [Info] Status: failed.
  [2017-01-12 10:08:54.539] [Exception] Initial task interrupted by exception
  [2017-01-12 10:08:54.539] [Exception] System.AggregateException: One or more errors occurred. ---&gt; System.InvalidOperationException: No suitable component archive found.
  [2017-01-12 10:08:54.539] [Exception] at Xamarin.Web.Installer.TasksManager.DetectComponents () [0x00097] in /Users/builder/data/lanes/4029/b49471af/source/installer/Xamarin.Web.Installer/TasksManager.cs:297
  [2017-01-12 10:08:54.539] [Exception] --- End of inner exception stack trace ---
  [2017-01-12 10:08:54.539] [Exception] at System.Threading.Tasks.Task.ThrowIfExceptional (System.Boolean includeTaskCanceledExceptions) [0x00014] in /Library/Frameworks/Xamarin.Mac.framework/Versions/2.10.0.113/src/mono/mcs/class/referencesource/mscorlib/system/threading/Tasks/Task.cs:2157
  [2017-01-12 10:08:54.539] [Exception] at System.Threading.Tasks.Task.Wait (System.Int32 millisecondsTimeout, System.Threading.CancellationToken cancellationToken) [0x00052] in /Library/Frameworks/Xamarin.Mac.framework/Versions/2.10.0.113/src/mono/mcs/class/referencesource/mscorlib/system/threading/Tasks/Task.cs:3189
  [2017-01-12 10:08:54.539] [Exception] at System.Threading.Tasks.Task.Wait (System.Threading.CancellationToken cancellationToken) [0x00000] in /Library/Frameworks/Xamarin.Mac.framework/Versions/2.10.0.113/src/mono/mcs/class/referencesource/mscorlib/system/threading/Tasks/Task.cs:3107
  [2017-01-12 10:08:54.539] [Exception] at Xamarin.Web.Installer.TasksManager.WaitForTask (System.Threading.Tasks.Task task, System.String taskName) [0x00084] in /Users/builder/data/lanes/4029/b49471af/source/installer/Xamarin.Web.Installer/TasksManager.cs:165
  [2017-01-12 10:08:54.539] [Exception] ---&gt; (Inner Exception #0) System.InvalidOperationException: No suitable component archive found.
  [2017-01-12 10:08:54.539] [Exception] at Xamarin.Web.Installer.TasksManager.DetectComponents () [0x00097] in /Users/builder/data/lanes/4029/b49471af/source/installer/Xamarin.Web.Installer/TasksManager.cs:297 &lt;---
  [2017-01-12 10:08:54.648] [Debug] Detection complete on the introduction page, determining the next step.
  </code></pre>