Value cannot be null errors in parallel builds

Hi,
With the example solution I it fails to build when I enable "Parallel Builds’

[MotionTransitioning] <- Task RemObjects.EBuild.Elements.ElementsPreparePlatforms finished for MotionTransitioning, took 2.0278s (2.0280s).
[MotionTransitioning] – Task RemObjects.EBuild.Elements.ElementsResolveSourceFiles skipped for MotionTransitioning, Toffee-iOS, already ran.
[MotionTransitioning] – Task RemObjects.EBuild.Elements.ElementsResolveHeaderImportFiles skipped for MotionTransitioning, Toffee-iOS, already ran.
[MotionTransitioning] -> Task RemObjects.EBuild.Elements.ElementsPreCompile started for MotionTransitioning, Toffee-iOS.
[MotionTransitioning] – Task RemObjects.EBuild.Elements.ElementsPreCompileEchoes skipped for MotionTransitioning, Toffee-iOS, already ran.
[MotionTransitioning] – Task RemObjects.EBuild.Elements.ElementsPreCompileToffee skipped for MotionTransitioning, Toffee-iOS, already ran.
[MotionTransitioning] – Task RemObjects.EBuild.Elements.ElementsPreCompileCooper skipped for MotionTransitioning, Toffee-iOS, already ran.
[MotionTransitioning] – Task RemObjects.EBuild.Elements.ElementsPreCompileIsland skipped for MotionTransitioning, Toffee-iOS, already ran.
[MotionTransitioning] <- Task RemObjects.EBuild.Elements.ElementsPreCompile finished for MotionTransitioning, Toffee-iOS, took 0.0000s (2.0300s).
[MotionTransitioning] – Task RemObjects.EBuild.Elements.ElementsResolveReferences skipped for MotionTransitioning, already ran.
[MotionTransitioning] – Task RemObjects.EBuild.Elements.ElementsPreCompile2 skipped for MotionTransitioning, Toffee-iOS, already ran.
[MotionTransitioning] -> Task RemObjects.EBuild.Elements.ElementsCompile started for MotionTransitioning.
[MotionTransitioning] Importing target ‘Toffee-iOS’ (Device-arm64)
[MotionTransitioning]E: Value cannot be null.
[MotionTransitioning] <- Task RemObjects.EBuild.Elements.ElementsCompile failed for MotionTransitioning, took 0.0095s (2.0398s).
[MotionTransitioning] <- Task RemObjects.EBuild.Elements.ElementsBuildProject failed for MotionTransitioning, took 0.0000s (2.0400s).
[MotionTransitioning] <- Project MotionTransitioning failed, took 2.0404s.
[MotionTransitioning] Project ‘MotionTransitioning’ failed to build.
[MotionTransitioning] -> Task RemObjects.EBuild.Elements.ElementsBuildProject started for MotionTransitioning.
Project ‘MaterialTableView’ depends on project ‘MaterialComponents’, which was not built yet. Waiting.
Parameter name: path
Parameter name: path
Parameter name: path
Project ‘MotionAnimator’ was waiting forproject ‘MotionInterchange’, which has now finished.
Project ‘MotionAnimator’ depends on project ‘MotionInterchange’, which failed to build prior. Skipping.
Project ‘MaterialComponents’ was waiting forproject ‘MDFTextAccessibility’, which has now finished.
Project ‘MaterialComponents’ depends on project ‘MDFTextAccessibility’, which failed to build prior. Skipping.

It has 3 ‘value cannot be null’ errors.

Cheers,
John