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Failed to load type "Xamarin.Forms.Preserve Attribute" from the assembly "Xamarin.Forms.Core"

I just inherited the old Xamarin Forms application and I am trying to update all packages. Initially, the application started normally, but from the moment of updating to the latest version of all packages I get an error message Xamarin.Forms.Forms.Init(this, bundle);:

Could not load type 'Xamarin.Forms.PreserveAttribute' from assembly 'Xamarin.Forms.Core, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null'.

Here is the contents of the package.config file:

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="ExifLib.PCL" version="1.0.1" targetFramework="MonoAndroid50" />
  <package id="Microsoft.Bcl" version="1.1.10" targetFramework="MonoAndroid50" />
  <package id="Microsoft.Bcl.Build" version="1.0.21" targetFramework="MonoAndroid50" />
  <package id="Microsoft.Net.Http" version="2.2.29" targetFramework="MonoAndroid50" />
  <package id="Newtonsoft.Json" version="8.0.3" targetFramework="MonoAndroid50" />
  <package id="Xamarin.Android.Support.Animated.Vector.Drawable" version="23.3.0" targetFramework="MonoAndroid50" />
  <package id="Xamarin.Android.Support.Design" version="23.3.0" targetFramework="MonoAndroid50" />
  <package id="Xamarin.Android.Support.v4" version="23.3.0" targetFramework="MonoAndroid50" />
  <package id="Xamarin.Android.Support.v7.AppCompat" version="23.3.0" targetFramework="MonoAndroid50" />
  <package id="Xamarin.Android.Support.v7.CardView" version="23.3.0" targetFramework="MonoAndroid50" />
  <package id="Xamarin.Android.Support.v7.MediaRouter" version="23.3.0" targetFramework="MonoAndroid50" />
  <package id="Xamarin.Android.Support.v7.RecyclerView" version="23.3.0" targetFramework="MonoAndroid50" />
  <package id="Xamarin.Android.Support.Vector.Drawable" version="23.3.0" targetFramework="MonoAndroid50" />
  <package id="Xamarin.Forms" version="2.3.0.38-pre2" targetFramework="MonoAndroid50" />
  <package id="Xamarin.Forms.Labs" version="1.2.1-pre2" targetFramework="MonoAndroid44" />
  <package id="Xamarin.Forms.Maps" version="2.2.0.31" targetFramework="MonoAndroid50" />
  <package id="Xamarin.GooglePlayServices.Base" version="29.0.0.1" targetFramework="MonoAndroid50" />
  <package id="Xamarin.GooglePlayServices.Basement" version="29.0.0.1" targetFramework="MonoAndroid50" />
  <package id="Xamarin.GooglePlayServices.Maps" version="29.0.0.1" targetFramework="MonoAndroid50" />
  <package id="Xamarin.Insights" version="1.12.3" targetFramework="MonoAndroid50" />
</packages>
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4 answers

I closed Xamarin Studio and cleared the obj and bin folders and started Xamarin Studio again and everything worked fine

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, , Xamarin.Forms . , .

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Xamarin Forms (Native, Portable Class Library) PCL ( " " Visual Studio Xamarin.Forms/Content page).

, package.config PCL Xamarin.Forms, project.json UWP.

Xamarin.Forms package.config ​​.

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