"Exited with code 1" is a bad restore error message #2970

<?xml version="1.0" encoding="utf-8"?>
<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <AssemblyName>HttpFs</AssemblyName>
    <PackageId>HttpFs</PackageId>
    <Version>5.0</Version>
    <TargetFrameworks>netstandard2.0;net461</TargetFrameworks>
  </PropertyGroup>
  <ItemGroup>
    <Compile Include="..\paket-files\haf\YoLo\YoLo.fs">
      <Paket>True</Paket>
      <Link>paket-files/YoLo.fs</Link>
    </Compile>
    <Compile Include="..\paket-files\logary\logary\src\Logary.Facade\Facade.fs">
      <Paket>True</Paket>
      <Link>paket-files/Facade.fs</Link>
    </Compile>
    <Compile Include="AssemblyInfo.fs" />
    <Compile Include="HttpFs.fs" />
    <PackageReference Include="FSharp.Core" Version="4.1.18" />
  </ItemGroup>
  <ItemGroup Condition="'$(TargetFramework)'!='net461'">
    <PackageReference Include="System.Diagnostics.FileVersionInfo" Version="4.3.0" />
  </ItemGroup>
  <Import Project="..\.paket\Paket.Restore.targets" />
</Project>

Finished Target: Clean
Starting Target: AssemblyInfo (==> Clean)
Created AssemblyInfo file "HttpFs/AssemblyInfo.fs".
Finished Target: AssemblyInfo
Starting Target: PaketFiles (==> AssemblyInfo)
Finished Target: PaketFiles
Starting Target: ProjectVersion (==> PaketFiles)
Finished Target: ProjectVersion
Starting Target: BuildTest (==> ProjectVersion)
dotnet "build" "HttpFs.UnitTests/HttpFs.UnitTests.fsproj" --configuration Release --framework netcoreapp2.0
Microsoft (R) Build Engine version 15.5.179.9764 for .NET Core
Copyright (C) Microsoft Corporation. All rights reserved.

  f156589e866cf26dc74ebae4deb2682472e2dc51
  f156589e866cf26dc74ebae4deb2682472e2dc51
  Paket version 5.129.1
  Performance:
   - Runtime: 2 seconds
  Paket failed with
  -> Extracting platforms from path 'netcoreapp2.0;net461' failed
/Users/h/dev/logibit/Http.fs/.paket/Paket.Restore.targets(108,5): error MSB3073: The command "/Library/Frameworks/Mono.framework/Commands/mono --runtime=v4.0.30319 "/Users/h/dev/logibit/Http.fs/.paket/paket.exe" restore --project "/Users/h/dev/logibit/Http.fs/HttpFs.UnitTests/HttpFs.UnitTests.fsproj"" exited with code 1. [/Users/h/dev/logibit/Http.fs/HttpFs.UnitTests/HttpFs.UnitTests.fsproj]