HarvestProject in Wix and WixToolset.Heat 4.0.0-rc2 doesn't seem to do anything

[iangiffen]

Hello,

I am coming from experience using Wix3 where I used heat in a pre-build event to generate a wxs file.
I am creating a new Wix 4 project from scratch, for a different solution, and am not converting from Wix 3.

I am trying to follow the Heat Harvesting guide from HeatWave
https://wixtoolset.org/docs/reference/heat/#using-harvestproject-to-harvest-output-from-a-project

and I have implemented HarvestProject like so:

When I do this, I do not get any output from Heat in the Output tab.
If I try to reference the ComponentGroupRef .Binaries and .Components I get an error:

I'm assuming it's because Heat didn't actually generate anything.

If I change this to a HarvestDirectory, then I do see output in the Output tab.

Any assistance you can provide would be greatly appreciated,

Thank you,

[iangiffen]

I'm sorry, I just realized that it was showing an error in the generated _Client.Service.wxs that heat is generating. I am debugging...