title: Xamarin.Android.Support.Fragment, Version=1.0.0.0, Culture=neutral, PublicKeyToken='. Perhaps it doesn't exist in the Mono for Android profile?
body: <p>I attempted to use Xamarin.Android.Support libraries version 25.3.1 but because of a bug I decided to downgrade back to my previous version 23.3.0. After Downgrading I am getting this error message below. whatever I tried, i cant get rid of it. I tried to delete all bin, obj, tmp etc folders. restarted VS2015, clean,rebuild...</p>
  
  <pre><code>    Severity    Code    Description Project File    Line    Suppression State
      Error       Exception while loading assemblies: System.IO.FileNotFoundException: Could not load assembly 
  'Xamarin.Android.Support.Fragment, Version=1.0.0.0, Culture=neutral,
   PublicKeyToken='. Perhaps it doesn't exist in the Mono for Android profile?
      File name: 'Xamarin.Android.Support.Fragment.dll'
         at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Resolve(AssemblyNameReference reference, ReaderParameters parameters)
         at Xamarin.Android.Tasks.ResolveAssemblies.AddAssemblyReferences(DirectoryAssemblyResolver resolver, ICollection`1 assemblies, AssemblyDefinition assembly, Boolean topLevel)
         at Xamarin.Android.Tasks.ResolveAssemblies.Execute(DirectoryAssemblyResolver resolver)       
  </code></pre>
  
  <p>I found out a small change in my package.config file. All below 
  targetFramework="monoandroid71" now. Before upgrade-downgrade, they were targetFramework="monoandroid70", I replaced them manulla but, it didnt help at all. How can I fix this problem? </p>
  
  <pre><code>  &lt;package id="Xamarin.Android.ShortcutBadger" version="1.1.809" targetFramework="monoandroid71" /&gt;
    &lt;package id="Xamarin.Android.Support.Animated.Vector.Drawable" version="23.3.0" targetFramework="monoandroid71" /&gt;
    &lt;package id="Xamarin.Android.Support.CustomTabs" version="23.3.0" targetFramework="monoandroid71" /&gt;
    &lt;package id="Xamarin.Android.Support.Design" version="23.3.0" targetFramework="monoandroid71" /&gt;
    &lt;package id="Xamarin.Android.Support.v4" version="23.3.0" targetFramework="monoandroid71" /&gt;
    &lt;package id="Xamarin.Android.Support.v7.AppCompat" version="23.3.0" targetFramework="monoandroid71" /&gt;
    &lt;package id="Xamarin.Android.Support.v7.CardView" version="23.3.0" targetFramework="monoandroid71" /&gt;
    &lt;package id="Xamarin.Android.Support.v7.MediaRouter" version="23.3.0" targetFramework="monoandroid71" /&gt;
    &lt;package id="Xamarin.Android.Support.v7.Palette" version="23.3.0" targetFramework="monoandroid71" /&gt;
  </code></pre>
  
  <p>How my settings looks like
  <a href="https://i.stack.imgur.com/dZJUq.png" rel="noreferrer"><img src="https://i.stack.imgur.com/dZJUq.png" alt="enter image description here"></a></p>
  
  <p>References:
  <a href="https://i.stack.imgur.com/NAZmT.png" rel="noreferrer"><img src="https://i.stack.imgur.com/NAZmT.png" alt="enter image description here"></a></p>
  
  <p>UPDATE:
  I have reinstalled all nugetpackages and succeed to run android project on 1 pc but interesting thing is same project is not running on another pc. It returns different but similar error.</p>
  
  <pre><code>Severity    Code    Description Project File    Line    Suppression State
  Error       The "ResolveLibraryProjectImports" task failed unexpectedly.
  System.IO.FileNotFoundException: Could not load assembly 'myApp, Version=0.0.0.0, Culture=neutral, PublicKeyToken='. Perhaps it doesn't exist in the Mono for Android profile?
  File name: 'myApp.dll'
     at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Resolve(AssemblyNameReference reference, ReaderParameters parameters)
     at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Resolve(String fullName, ReaderParameters parameters)
     at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Resolve(String fullName)
     at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.GetAssembly(String fileName)
     at Xamarin.Android.Tasks.ResolveLibraryProjectImports.Extract(DirectoryAssemblyResolver res, ICollection`1 jars, ICollection`1 resolvedResourceDirectories, ICollection`1 resolvedAssetDirectories, ICollection`1 resolvedEnvironments)
     at Xamarin.Android.Tasks.ResolveLibraryProjectImports.Execute()
     at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
     at Microsoft.Build.BackEnd.TaskBuilder.&lt;ExecuteInstantiatedTask&gt;d__26.MoveNext() myApp.Droid     
  </code></pre>