Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe'

Question

Trying to use SQLTypeProvider with postgres I get the following errorwhen running

dotnet build

error FS3033: The type provider 'FSharp.Data.Sql.SqlTypeProvider' reported an error: Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe, Version=4.0.4.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. The system cannot find the file specified. [/home/sashan/code/titan/src/Server/Server.fsproj]

my data provider is this:

type SQL = SqlDataProvider< 
                  ConnectionString = pg_dev_conn_string,
                  DatabaseVendor = Common.DatabaseProviderTypes.POSTGRESQL,
                  UseOptionTypes = true >

If I change it to the following

type SQL = SqlDataProvider< 
              ConnectionString = pg_dev_conn_string,
              DatabaseVendor = Common.DatabaseProviderTypes.POSTGRESQL,
              ResolutionPath = "/home/sashan/code/dotnet/2.1.500/sdk/NuGetFallbackFolder/system.runtime.compilerservices.unsafe/4.5.1/lib/netcoreapp2.0",
              UseOptionTypes = true >

The error goes away but I don't understand why. The fix seems really weird. Why should I have to point it to a file outside of my project? Shouldn't the System.Runtime.CompilerServices.Unsafe.dll be somewhere in one of project's subdirectories where the compiler can find it?

Answer 1

i fix it comenting in web.config the entry that contains System.Runtime.CompilerServices.Unsafe

Answer 2

I had the same problem with unity container and after updated this dll from Nuget my problem solved