> ## Content Index > Fetch the complete content index at: https://codetraveler.io/llms.txt > Use this file to discover other available public pages before exploring further. # Version Conflict Detected for Xamarin.Android.Support - URL: https://codetraveler.io/2019/10/08/xamarin-android-nuget-version-conflict-detected/ - Published: 2019-10-08T21:48:54.000Z - Updated: 2019-10-08T21:51:11.000Z - Description: Both Xamarin.Forms and Xamarin.Essentials recently increased their Xamarin.Android.Support dependency to v28.0.0.3, and it might cause a weird error when updating NuGet Packages. Let's see how to fix it! - Author: Brandon Minnick - Tags: Xamarin, Xamarin.Android, NuGet, Xamarin.Android.Support, Android, Android.Support.V7.Widget.SearchView, Support Library, Support Libraries, Android Support Libraries, Xamarin.Android Support Libraries Both Xamarin.Forms and Xamarin.Essentials recently increased their `Xamarin.Android.Support` dependency to v28.0.0.3, and it might cause a weird error when updating NuGet Packages. Let's see how to fix it! ## What's The Error? When updating to the latest versions of Xamarin.Forms or Xamarin.Essentials, you may see one of these error messages: `Package restore failed. Rolling back package changes for 'MyApp.Android'.` or `Version conflict detected for Xamarin.Android.Support.Compat` (For nostalgia and SEO purposes, I've pasted the complete error message at the bottom of this blog post) ## What Caused It? Xamarin.Forms v4.2.0.848062 and Xamarin.Essentials v1.3.1 now target v28.0.0.3 of the Xamarin.Android.Support libraries. But, their previous versions targeted v28.0.0.1 of the Xamarin.Android.Support libraries. | Xamarin.Forms v4.2.0.778463 | Xamarin.Forms v4.2.0.848062 | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | ![Xamarin.Forms v4.2.0.778463 Android Dependencies](https://storage.ghost.io/c/dc/c2/dcc2e43e-24f8-46bb-a899-9c446f3ef794/content/images/2019/10/Screen-Shot-2019-10-08-at-2.08.41-PM.png) | ![Xamarin.Forms v4.2.0.848062 Android Dependencies](https://storage.ghost.io/c/dc/c2/dcc2e43e-24f8-46bb-a899-9c446f3ef794/content/images/2019/10/Screen-Shot-2019-10-08-at-2.03.12-PM.png) | | Xamarin.Essentials v1.3.0 | Xamarin.Essentials v1.3.1 | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | ![Xamarin.Essentials v1.3.0 Android Dependencies](https://storage.ghost.io/c/dc/c2/dcc2e43e-24f8-46bb-a899-9c446f3ef794/content/images/2019/10/Screen-Shot-2019-10-08-at-2.11.32-PM.png) | ![Xamarin.Essentials v1.3.1 Android Dependencies](https://storage.ghost.io/c/dc/c2/dcc2e43e-24f8-46bb-a899-9c446f3ef794/content/images/2019/10/Screen-Shot-2019-10-08-at-2.13.44-PM.png) | Updating Xamarin.Essentials before updating Xamarin.Forms in our Xamarin.Android project is causing a NuGet Package Dependency conflict where one package needs v28.0.0.3 while the other needs v28.0.0.1\. ## How Do We Fix It? The quickest way to resolve this error is to update the NuGet Package references simultaneously, directly at the source. In the Xamarin.Android project's `csproj` file, we can set the NuGet Version manually: ![](https://storage.ghost.io/c/dc/c2/dcc2e43e-24f8-46bb-a899-9c446f3ef794/content/images/2019/10/image.png) #### Before ```xml ``` #### After ```xml ``` > *Note that I've removed every Xamarin.Android.Support library `PackageReference`* ## Conclusion NuGet packages dependencies can sometimes be a pain, especially when two packages reference different versions of the same NuGet Package. To fix this error in particular, we can update them both simultaneously in the Xamarin.Android `csproj` file. ## Complete NuGet Error ``` GET https://api.nuget.org/v3/registration3-gz-semver2/xamarin.essentials/index.json OK https://api.nuget.org/v3/registration3-gz-semver2/xamarin.essentials/index.json 270ms Getting restore information for project /Users/bramin/Projects/MyApp/MyApp.Android/MyApp.Android.csproj Getting restore information for project /Users/bramin/Projects/MyApp/MyApp.iOS/MyApp.iOS.csproj Running non-parallel restore. Reading project file /Users/bramin/Projects/MyApp/MyApp.Android/MyApp.Android.csproj. Persisting no-op dg to /Users/bramin/Projects/MyApp/MyApp.Android/obj/MyApp.Android.csproj.nuget.dgspec.json Restoring packages for /Users/bramin/Projects/MyApp/MyApp.Android/MyApp.Android.csproj... Restoring packages for MonoAndroid,Version=v9.0... Resolving conflicts for MonoAndroid,Version=v9.0... Version conflict detected for Xamarin.Android.Support.Compat. Install/reference Xamarin.Android.Support.Compat 28.0.0.3 directly to project MyApp.Android to resolve this issue. MyApp.Android -> Xamarin.Essentials 1.3.1 -> Xamarin.Android.Support.Compat (>= 28.0.0.3) MyApp.Android -> Xamarin.Forms 4.2.0.709249 -> Xamarin.Android.Support.v4 28.0.0.1 -> Xamarin.Android.Support.Compat (= 28.0.0.1). Checking compatibility of packages on MonoAndroid,Version=v9.0. Checking compatibility for MyApp.Android 1.0.0 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Essentials 1.3.1 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Forms 4.2.0.709249 with MonoAndroid,Version=v9.0. Checking compatibility for MyApp 1.0.0 with MonoAndroid,Version=v9.0. Checking compatibility for System.Numerics.Vectors 4.5.0 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.Compat 28.0.0.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.Core.Utils 28.0.0.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.CustomTabs 28.0.0.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.v4 28.0.0.1 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.Design 28.0.0.1 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.v7.AppCompat 28.0.0.1 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.v7.CardView 28.0.0.1 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Arch.Lifecycle.Runtime 1.1.1.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.Collections 28.0.0.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.Annotations 28.0.0.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.VersionedParcelable 28.0.0.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.DocumentFile 28.0.0.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.Loader 28.0.0.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.LocalBroadcastManager 28.0.0.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.Print 28.0.0.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.Interpolator 28.0.0.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.Core.UI 28.0.0.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.Fragment 28.0.0.1 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.Media.Compat 28.0.0.1 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.v7.RecyclerView 28.0.0.1 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.Transition 28.0.0.1 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.Animated.Vector.Drawable 28.0.0.1 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.Vector.Drawable 28.0.0.1 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Arch.Core.Common 1.1.1.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Arch.Lifecycle.Common 1.1.1.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Arch.Lifecycle.LiveData 1.1.1.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Arch.Lifecycle.ViewModel 1.1.1.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.AsyncLayoutInflater 28.0.0.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.CoordinaterLayout 28.0.0.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.CursorAdapter 28.0.0.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.CustomView 28.0.0.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.DrawerLayout 28.0.0.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.SlidingPaneLayout 28.0.0.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.SwipeRefreshLayout 28.0.0.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Support.ViewPager 28.0.0.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Arch.Core.Runtime 1.1.1.3 with MonoAndroid,Version=v9.0. Checking compatibility for Xamarin.Android.Arch.Lifecycle.LiveData.Core 1.1.1.3 with MonoAndroid,Version=v9.0. All packages and projects are compatible with MonoAndroid,Version=v9.0. Package restore failed. Rolling back package changes for 'MyApp.Android'. ```