Forum Xamarin Xamarin.Forms

Could not load assembly Microsoft.Threading.Tasks

PouyaJavadzadehPouyaJavadzadeh USMember ✭✭
edited March 2016 in Xamarin.Forms


I am receiving the following error on iOS and Android project. Anybody has any workaround for this issue? This post recommends a workaround but the steps are vague.

C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.targets(2,2): Error: Exception while loading assemblies: System.IO.FileNotFoundException: Could not load assembly 'Microsoft.Threading.Tasks, Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. Perhaps it doesn't exist in the Mono for Android profile? File name: 'Microsoft.Threading.Tasks.dll' at Xamarin.Android.Tuner.DirectoryAssemblyResolver.Resolve(AssemblyNameReference reference, ReaderParameters parameters) at Xamarin.Android.Tasks.ResolveAssemblies.AddAssemblyReferences(ICollection1 assemblies, AssemblyDefinition assembly, Boolean topLevel) at Xamarin.Android.Tasks.ResolveAssemblies.AddAssemblyReferences(ICollection1 assemblies, AssemblyDefinition assembly, Boolean topLevel) at Xamarin.Android.Tasks.ResolveAssemblies.Execute() (Braemar.Vers.Mobile.Droid)

I think that these two paths should have this file but I couldn't find it.
C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\MonoAndroid\v1.0
C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\MonoTouch\v1.0

Xamarin Studio:
Version 5.10.2 (build 56)
Installation UUID: 88f72eda-5030-43e9-8d1b-7658e8a17627

Microsoft .NET 4.0.30319.42000
GTK+ 2.24.23 (MS-Windows theme)
GTK# 2.12.30

Version: (Business Edition)
Android SDK: C:\Android\android-sdk
Supported Android versions:
2.3 (API level 10)
4.0.3 (API level 15)
4.1 (API level 16)
4.2 (API level 17)
4.3 (API level 18)
4.4 (API level 19)
4.4.87 (API level 20)
5.0 (API level 21)
5.1 (API level 22)
6.0 (API level 23)

SDK Tools Version: 24.4.1
SDK Platform Tools Version: 23.1.0 rc1
SDK Build Tools Version: 23.0.2

Java SDK: C:\Program Files (x86)\Java\jdk1.7.0_71
java version "1.7.0_71"
Java(TM) SE Runtime Environment (build 1.7.0_71-b14)
Java HotSpot(TM) Client VM (build 24.71-b01, mixed mode, sharing)

Build Information:
Release ID: 510020056
Git revision: bb74ff467c62ded42b7b7ac7fdd2edc60f8647b0
Build date: 2016-01-26 15:49:39-05
Xamarin addins: 8b797d7ba24d5abab226c2cf9fda77f666263f1b
Build lane: monodevelop-windows-cycle6-c6sr1

Operating System:
Windows 10.0.10586.0 (64-bit)

Project Information:
PCL 4.5 - Profile 7


  • PouyaJavadzadehPouyaJavadzadeh USMember ✭✭

    Can I have any comment on this problem from you @BrendanZagaeski ?

  • PouyaJavadzadehPouyaJavadzadeh USMember ✭✭

    Hi @AlexEnrquez, you may want to look at the logs in this old thread also!

  • AeneasMotschAeneasMotsch USMember ✭✭
    edited November 2016

    I have exactly the same problem, just with Visual Studio 2015 Pro and
    TargetFrameworkVersionv: 4.5
    TargetFrameworkProfile: Profile111

    Goin' crazy trying to solve this Problem for 3 days now.

  • AeneasMotschAeneasMotsch USMember ✭✭

    I solved it by downloading Microsoft.Bcl.Async from NuGet.
    I am using a CrossPlattform-project. The Microsoft.Bcl.Async must be referenced by the PCL that is created automatically by creating a new CP-project. Then you have reference the Microsoft.Bcl.Async in every PCL that you add to your project.
    Hope that helps

  • Oracle22Oracle22 USMember ✭✭

    I have install the package Microsoft.Bcl.Async from NuGet and i have Resolve my problem.
    Thanks @AeneasMotsch

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