Required Assembly For an MSBuild Task Cannot Be Loaded

I am trying to run a simple task after build in a .NET Core console app.

Here is my cspoj:

<Project Sdk="Microsoft.NET.Sdk">

    <PropertyGroup>
        <OutputType>Exe</OutputType>
        <TargetFramework>netcoreapp3.1</TargetFramework>
    </PropertyGroup>

    <ItemGroup>
        <PackageReference Include="Microsoft.Build.Utilities.Core" Version="16.8.0" />
    </ItemGroup>


    <UsingTask TaskName="SimpleTask" AssemblyFile = "bin\Debug\netcoreapp3.1\ConsoleApp10.dll">

    </UsingTask>

    <Target Name="MyTarget" AfterTargets="Build">
        <SimpleTask/>
    </Target>

</Project>

And here is the task class:

using Microsoft.Build.Utilities;


namespace ConsoleApp10.MyTasks
{
    public class SimpleTask : Task
    {
        public override bool Execute()
        {
            Log.LogWarning("warning message");
            return true;
        }

        public string MyProperty { get; set; }
    }
}

But I am getting the following error:

Error   MSB4018 The "SimpleTask" task failed unexpectedly.
System.IO.FileNotFoundException: Could not load file or assembly 'System.Runtime, Version=4.2.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
File name: 'System.Runtime, Version=4.2.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
   at ConsoleApp10.MyTasks.SimpleTask.Execute()
   at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
   at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext()

WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.

I could not figure out what the problem is.