.NET Core projects supporting portable profiles are suddenly failing with FileNotFoundException: File not found: '*.pri' #5021
Description
On completely different projects on appveyor I'm suddenly seeing PackTask failures as shown below. All these are open source projects so you can follow the links to the source code if you want.
Code-generation: Good Bad
vs-validation: Good Bad
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\Sdks\NuGet.Build.Tasks.Pack\buildCrossTargeting\NuGet.Build.Tasks.Pack.targets(104,5): error MSB4018: The "PackTask" task failed unexpectedly. [C:\projects\codegeneration-roslyn\src\CodeGeneration.Roslyn.Attributes\CodeGeneration.Roslyn.Attributes.csproj]
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\Sdks\NuGet.Build.Tasks.Pack\buildCrossTargeting\NuGet.Build.Tasks.Pack.targets(104,5): error MSB4018: System.IO.FileNotFoundException: File not found: 'C:\projects\codegeneration-roslyn\bin\CodeGeneration.Roslyn.Attributes\Release\portable-net40+win8+wpa81\CodeGeneration.Roslyn.Attributes.pri'. [C:\projects\codegeneration-roslyn\src\CodeGeneration.Roslyn.Attributes\CodeGeneration.Roslyn.Attributes.csproj]
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\Sdks\NuGet.Build.Tasks.Pack\buildCrossTargeting\NuGet.Build.Tasks.Pack.targets(104,5): error MSB4018: at NuGet.Packaging.PackageBuilder.AddFiles(String basePath, String source, String destination, String exclude) [C:\projects\codegeneration-roslyn\src\CodeGeneration.Roslyn.Attributes\CodeGeneration.Roslyn.Attributes.csproj]
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\Sdks\NuGet.Build.Tasks.Pack\buildCrossTargeting\NuGet.Build.Tasks.Pack.targets(104,5): error MSB4018: at NuGet.Packaging.PackageBuilder.PopulateFiles(String basePath, IEnumerable`1 files) [C:\projects\codegeneration-roslyn\src\CodeGeneration.Roslyn.Attributes\CodeGeneration.Roslyn.Attributes.csproj]
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\Sdks\NuGet.Build.Tasks.Pack\buildCrossTargeting\NuGet.Build.Tasks.Pack.targets(104,5): error MSB4018: at NuGet.Commands.MSBuildProjectFactory.CreateBuilder(String basePath, NuGetVersion version, String suffix, Boolean buildIfNeeded, PackageBuilder builder) [C:\projects\codegeneration-roslyn\src\CodeGeneration.Roslyn.Attributes\CodeGeneration.Roslyn.Attributes.csproj]
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\Sdks\NuGet.Build.Tasks.Pack\buildCrossTargeting\NuGet.Build.Tasks.Pack.targets(104,5): error MSB4018: at NuGet.Commands.PackCommandRunner.BuildFromProjectFile(String path) [C:\projects\codegeneration-roslyn\src\CodeGeneration.Roslyn.Attributes\CodeGeneration.Roslyn.Attributes.csproj]
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\Sdks\NuGet.Build.Tasks.Pack\buildCrossTargeting\NuGet.Build.Tasks.Pack.targets(104,5): error MSB4018: at NuGet.Commands.PackCommandRunner.BuildPackage(String path) [C:\projects\codegeneration-roslyn\src\CodeGeneration.Roslyn.Attributes\CodeGeneration.Roslyn.Attributes.csproj]
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\Sdks\NuGet.Build.Tasks.Pack\buildCrossTargeting\NuGet.Build.Tasks.Pack.targets(104,5): error MSB4018: at NuGet.Commands.PackCommandRunner.BuildPackage() [C:\projects\codegeneration-roslyn\src\CodeGeneration.Roslyn.Attributes\CodeGeneration.Roslyn.Attributes.csproj]
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\Sdks\NuGet.Build.Tasks.Pack\buildCrossTargeting\NuGet.Build.Tasks.Pack.targets(104,5): error MSB4018: at NuGet.Build.Tasks.Pack.PackTaskLogic.BuildPackage(PackCommandRunner runner) [C:\projects\codegeneration-roslyn\src\CodeGeneration.Roslyn.Attributes\CodeGeneration.Roslyn.Attributes.csproj]
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\Sdks\NuGet.Build.Tasks.Pack\buildCrossTargeting\NuGet.Build.Tasks.Pack.targets(104,5): error MSB4018: at NuGet.Build.Tasks.Pack.PackTask.Execute() [C:\projects\codegeneration-roslyn\src\CodeGeneration.Roslyn.Attributes\CodeGeneration.Roslyn.Attributes.csproj]
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\Sdks\NuGet.Build.Tasks.Pack\buildCrossTargeting\NuGet.Build.Tasks.Pack.targets(104,5): error MSB4018: at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute() [C:\projects\codegeneration-roslyn\src\CodeGeneration.Roslyn.Attributes\CodeGeneration.Roslyn.Attributes.csproj]
C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\MSBuild\Sdks\NuGet.Build.Tasks.Pack\buildCrossTargeting\NuGet.Build.Tasks.Pack.targets(104,5): error MSB4018: at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext() [C:\projects\codegeneration-roslyn\src\CodeGeneration.Roslyn.Attributes\CodeGeneration.Roslyn.Attributes.csproj]
Tip: these are not UWP projects so I wouldn't expect any .pri files.