Upgrade error from 1.1.1: 'FileMode' exists in both 'System.IO.FileSystem.Primitives' and 'System.Runtime, Version=4.2.0.0

Question

After updating my project to 1.1.1 the following two lines do not work: var d = new FileStream(Path.Combine(PathToFile, $"{fileName}.txt"), FileMode.Open); var fs = new StreamReader(d,Encoding.UTF8);

When I reverted the chane to the csproj file, the error disappeared. What am I doing wrong?

I get the following error:

1. Error CS0433 The type 'StreamReader' exists in both 'System.IO, Version=4.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'System.Runtime.Extensions, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
2. Error CS0433 The type 'FileMode' exists in both 'System.IO.FileSystem.Primitives, Version=4.0.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'System.Runtime, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
3. Error CS0433 The type 'Encoding' exists in both 'System.Text.Encoding, Version=4.0.10.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'System.Runtime, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
4. Error CS0433 The type 'Encoding' exists in both 'System.Text.Encoding, Version=4.0.10.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' and 'System.Runtime, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
5. Error CS1503 Argument 1: cannot convert from 'string' to 'System.IntPtr'

My csproj file is:

<Project Sdk="Microsoft.NET.Sdk.Web">
  <PropertyGroup>
    <TargetFramework>netcoreapp1.1</TargetFramework>
    <DebugType>portable</DebugType>
    <AssemblyName>Backend</AssemblyName>
    <OutputType>Exe</OutputType>
    <PackageId>Backend</PackageId>
    <PackageTargetFallback>portable-net45+win8</PackageTargetFallback>
    <DockerComposeProjectPath>..\docker-compose.dcproj</DockerComposeProjectPath>
  </PropertyGroup>
  <ItemGroup>
    <Compile Remove="Model\**" />
    <Content Remove="Model\**" />
    <EmbeddedResource Remove="Model\**" />
    <None Remove="Model\**" />
  </ItemGroup>
  <ItemGroup>
    <ProjectReference Include="..\Engine\Engine.csproj" />
  </ItemGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Diagnostics" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Server.IISIntegration" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="1.1.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="1.1.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="1.1.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer.Design" Version="1.1.1" />
    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.ResponseCompression" Version="1.0.1" />
    <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="1.1.1" />
    <PackageReference Include="Microsoft.VisualStudio.Web.BrowserLink" Version="1.1.0" />
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="1.1.0" />
  </ItemGroup>
  <ItemGroup Condition=" '$(TargetFramework)' == 'netcoreapp1.1' ">
    <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="1.1.1" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="1.1.2" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc.Core" Version="1.1.2" />
    <PackageReference Include="Microsoft.AspNetCore.Cors" Version="1.1.1" />
    <PackageReference Include="System.ValueTuple" Version="4.3.0" />
  </ItemGroup>
  <ItemGroup>
    <DotNetCliToolReference Include="Microsoft.DotNet.Watcher.Tools" Version="1.0.0-msbuild3-final" />
  </ItemGroup>
</Project>

Previous version:

<Project Sdk="Microsoft.NET.Sdk.Web">
  <PropertyGroup>
    <TargetFramework>netcoreapp1.1</TargetFramework>
    <DebugType>portable</DebugType>
    <AssemblyName>Backend</AssemblyName>
    <OutputType>Exe</OutputType>
    <PackageId>Backend</PackageId>
    <PackageTargetFallback>portable-net45+win8</PackageTargetFallback>
    <DockerComposeProjectPath>..\docker-compose.dcproj</DockerComposeProjectPath>
  </PropertyGroup>
  <ItemGroup>
    <Compile Remove="Model\**" />
    <Content Remove="Model\**" />
    <EmbeddedResource Remove="Model\**" />
    <None Remove="Model\**" />
  </ItemGroup>
  <ItemGroup>
    <ProjectReference Include="..\Engine\Engine.csproj" />
  </ItemGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore" Version="1.1.0" />
    <PackageReference Include="Microsoft.AspNetCore.Diagnostics" Version="1.0.1" />
    <PackageReference Include="Microsoft.AspNetCore.Server.IISIntegration" Version="1.0.1" />
    <PackageReference Include="Microsoft.AspNetCore.StaticFiles" Version="1.1.0" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="1.1.0" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="1.1.0" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer.Design" Version="1.1.0" />
    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="1.1.0" />
    <PackageReference Include="Microsoft.AspNetCore.ResponseCompression" Version="1.0.0" />
    <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="1.1.0" />
    <PackageReference Include="Microsoft.VisualStudio.Web.BrowserLink" Version="1.0.0" />
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="1.1.0-msbuild3-final" />
  </ItemGroup>
  <ItemGroup Condition=" '$(TargetFramework)' == 'netcoreapp1.1' ">
    <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="1.1.0" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="1.1.0" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc.Core" Version="1.1.0" />
    <PackageReference Include="Microsoft.AspNetCore.Cors" Version="1.1.0" />
    <PackageReference Include="System.IO" Version="4.3.0" />
    <PackageReference Include="System.ValueTuple" Version="4.3.0" />
  </ItemGroup>
  <ItemGroup>
    <DotNetCliToolReference Include="Microsoft.DotNet.Watcher.Tools" Version="1.0.0-msbuild3-final" />
  </ItemGroup>
</Project>

Answer 1

In my case this happened after installing a SPA template. I had to repair the visual studio so that it can fix the versions.

Answer 2

See here

Rebuilding the nuget package fixes it. Go to %USERPROFILE%/.nuget and clear it all.

And here

@ericwj According to joe on web tools team, that’s a known issue. There was one build of the BrowserLink package that had bad references, and that’s apparently the one that shipped with the .NET Core 1.1 CLI installer. However, in RC.3, we removed BrowserLink from the Core 1.1 template, so it shouldn’t be an issue with new projects.