Upgrade to 1.0 Power Fx

[MikeStall]

This is currently using an old prerelease build of Power Fx (https://github.com/microsoft/Power-Fx) .

It's using 0.2.1-preview here:

CoreWF/src/UiPath.Workflow/UiPath.Workflow.csproj

Line 26 in bd19569

<PackageReference Include="Microsoft.PowerFx.Interpreter" Version="0.2.1-preview"/>

GA builds are available (https://www.nuget.org/packages/Microsoft.PowerFx.Core) . Can you update to a GA build?

[lextm]

Resolved in #313