Forum Xamarin.Forms

Xamarin project opens up with error: Could not load file or assembly 'System.Collections.Immutable'

I'm working in a github cloned Xamarin project. When I open up the project it displays the following error:

Severity    Code    Description Project File    Line    Suppression State
Error       Could not load file or assembly 'System.Collections.Immutable, Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)    ProjectName C:\Users\USER\.nuget\packages\refit\4.6.30\build\netstandard1.4\refit.targets   29  

I've tried cleaning the project, deleting the bin/obj folders and I've cleared my nuget packages and restored. All of these solutions didn't work and when trying to rebuild the project it displays another error:

Severity    Code    Description Project File    Line    Suppression State
Error       The "ResolveLibraryProjectImports" task failed unexpectedly.
System.IO.FileNotFoundException: Could not load assembly 'ProjectName, Version=, Culture=neutral, PublicKeyToken='. Perhaps it doesn't exist in the Mono for Android profile?
File name: 'ProjectName.dll'
   at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Resolve(AssemblyNameReference reference, ReaderParameters parameters)
   at Java.Interop.Tools.Cecil.DirectoryAssemblyResolver.Resolve(String fullName)
   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.<ExecuteInstantiatedTask>d__26.MoveNext() ProjectName.Android         

I'm using Visual Studio Community 2017 version 15.8.8 and Xamarin.Forms

The project that I'm working on works on other pc's from co-workers so I think it has to do with my VS installation. I tried to reinstall VS but this resulted in the same errors.


  • AnubhavRanjanAnubhavRanjan INXamarin Team Xamurai

    @poolta321 Can you share the link from where you have cloned the Project?
    I have a feeling that the PCL/.Net Standard Project is not built

  • poolta321poolta321 Member ✭✭

    I can't do this since it's a project from the company I'm working as an intern at

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