Why can't GitHub Self-Hosted Runner find the included CrystalDecisions.CrystalReports.Engine package?

[Rod-at-DOH]

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I maintain an old ASP.NET VB.NET WebForms application written years ago. I don' think anyone knows who started it, because whoever started it didn't put the source code into any version control system. Then when the last guy left, before I was given it to maintain, he asked that his machine be reimagined, so I had to put it together from bits and pieces he left scattered around different servers. Last year I migrated the project to a repo in one of our GitHub organizations. I installed a GitHub Self-Hosted Runner onto one of our internal servers, since this web app runs as an Intranet app, with no exposure for a GitHub Runner to reach.

I can build the app fine on my dev box. However, the GH self-hosted runner will not build it. I've got a GH Action set up to perform the build on a child branch of main, when I push to it. It fails with this error:

D:\actions-runner_work\FP_Timetrack\FP_Timetrack\WicReports\rbWicHeader.vb(13,87): error BC30002: Type 'ReportClass' is not defined. [D:\actions-runner_work\FP_Timetrack\FP_Timetrack\WicReports\WicReports.vbproj]

Here's a code snippet that causes the above error:

Imports CrystalDecisions.CrystalReports.Engine
Imports PJAWic

Public Class rbWicHeader

    Private connString As String
    Dim Environ As String = ""
    Public Sub New(ByVal ConnectionString As String, ByVal Environment As String)
        connString = ConnectionString
        Environ = Environment
    End Sub

    Public Sub BuildHeader(ByVal ps As WicReportBasics.ReportParameters, ByVal rpt As ReportClass, Optional ByVal DataSource As String = Nothing)

Previously I pulled in the CrystalDecisions.CrystalReports.Engine package from NuGet.

So, I've got the NuGet package, in the solution. Visual Studio shows it there and it's fine. But GH self-hosted runner can't find it. Huh?? I don't get it, how can it simultaneously be there, but not be there?

Here's a snippet from my YAML file:

    - name: Restore NuGet Packages
      run: nuget restore $env:Solution_Name

    - name: Build and Publish
      run: msbuild $env:Solution_Name /p:Configuration=Release /p:DeployOnBuild=True /p:DeployIisAppPath="Default Web Site/TimeTrack_Test" /p:WebPublishMethod=MSDeploy /p:MSDeployServiceURL=**localhost** /p:DeleteExistingFiles=True /p:UserName="$env:DOH_Build_Account" /p:Password="$env:DOH_Build_Password" /p:PublishProfile=Default

[Rod-at-DOH]

When I build and debug the application, then try to go to any report, I get this error:

System.TypeInitializationException
HResult=0x80131534
Message=The type initializer for 'CrystalDecisions.CrystalReports.Engine.ReportDocument' threw an exception.
Source=CrystalDecisions.CrystalReports.Engine
StackTrace:
at CrystalDecisions.CrystalReports.Engine.ReportDocument..ctor()
at CrystalDecisions.CrystalReports.Engine.ReportClass..ctor()
at timetrackreports.rpt_tt0001..ctor() in C:\GitHub\Prod\FP_Timetrack\timetrackreports\rpt_tt0001.vb:line 27
at timetrackreports.rb0001.MakeReport(ReportParameters ps, String ConnectionString, String EnvironmentString) in C:\GitHub\Prod\FP_Timetrack\timetrackreports\rb0001.vb:line 10
at ReportPrinter.Page_Load(Object sender, EventArgs e) in C:\GitHub\Prod\FP_Timetrack\TimeTrackSite\ReportPrinter.aspx.vb:line 30

This exception was originally thrown at this call stack:

Inner Exception 1:
FileNotFoundException: Could not load file or assembly 'CrystalDecisions.ReportAppServer.CommLayer, Version=13.0.2000.0, Culture=neutral, PublicKeyToken=692fbea5521e1304' or one of its dependencies. The system cannot find the file specified.

The weird thing is I can find the assembly CrystalDecisions.ReportAppServer.CommLayer in my local Packages folder, so I don't understand why the application cannot find it when debugging.