An unhandled win32 exception occurred in PsfLauncher64.exe

Hello, and thanks for any help in advance.

I have a UWP application that I want to package with the Package Support Framework. All I want to do is run a simple PowerShell script upon installation of my package, however, I cannot seem to get Visual Studio to package it all together correctly. 

I have followed this guide: 
https://docs.microsoft.com/en-us/windows/msix/psf/package-support-framework-vs

I keep running into the same error trying to get the WAP solution to build: 
"An unhandled win32 exception occurred in PsfLauncher64.exe"

The only thing different I am doing is I do not have a runtime fix project, as I do not need one. I just want to run a PowerShell script. 

I cannot figure out what I am doing wrong, or not doing at all. 

As a workaround, I have attempted to configure my UWP application to package itself with the Package Support Framework. Essentially, configuring the Package.manifest to target the PsfLauncher64.exe, and bundling all the appropriate files together in the MSIX package when I hit "Publish" by right clicking my UWP project. That almost worked, as it it runs the script I have provided, but fails to launch my UWP application afterwards. All I can see in Event Viewer is an Error with the title "Event 1000, Application Error" with no other context as to why it fails to launch. 

I feel like I am very close to achieving my goal, but I am missing something. I'd like to do it the "correct way", from the information provided in the article using a Blank project for the PSF installed through NuGet, and a WAP project that targets the Blank project as it's entry point. 

My config.json looks like this:

{
  "processes": [
    {
      "executable": ".*App.*",
      "fixups": []
    }
  ],
  "applications": [
    {
      "id": "MyAppId",
      "executable": "MyApp.App",
      "startScript": {
        "scriptExecutionMode": "-ExecutionPolicy RemoteSigned",
        "scriptPath": "pre_install.ps1",
        "showWindow": false,
        "runInVirtualEnvironment": false,
        "waitForScriptToFinish": true
      }
    }
  ]
}

I have also included StartingScriptWrapper.ps1 in the WAP project as well.

Again, thanks for any help on this. It is slowly driving me crazy.