Published Package doesn't start

Bug description If a sideload package is created and installed it will not start. After attaching a VS debugger the following error message is produced even on the machine the build was created and release or debug builds within VS work fine. Error: An assembly specified in the application dependencies manifest (App1.deps.json) was not found: package: 'runtimepack.Microsoft.NETCore.App.Runtime.win-x64', version: '5.0.0' path: 'Microsoft.VisualBasic.Core.dll''App1.exe' (Win32): Loaded 'C:\Windows\System32\kernel.appcore.dll'. Symbols loaded.

dotnet --info produces following output:

.NET SDK (reflecting any global.json):
 Version:   5.0.100
 Commit:    5044b93829

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.19041
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\5.0.100\

Host (useful for support):
  Version: 5.0.0
  Commit:  cf258a14b7

.NET SDKs installed:
  5.0.100 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.All 2.1.23 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.23 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.23 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.1.9 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Steps to reproduce the bug

1. Create a new project with package
2. Publish package with sideloading (Add a valid Certificate for installation)
3. Install published package
4. (optional) Attach debugger (Debug -> Other debug targets -> Debug installed app packages)
5. Start App

Expected behavior App should start the same way as it does in VS

Version Info

• Microsoft.WinUI 3.0.0-preview3.201113.0
• Blank desktop App with package C#
• VS 16.9.0 Preview 1.0
• .net SDK 5.0.100 (Installed with VS)
• Windows 10 19041

NuGet package version: [Microsoft.WinUI 3.0.0-preview3.201113.0]

Windows app type:

UWP	Win32
	Yes

Windows 10 version	Saw the problem?
Insider Build (xxxxx)
May 2020 Update (19041)	Yes
November 2019 Update (18363)
May 2019 Update (18362)
October 2018 Update (17763)
April 2018 Update (17134)
Fall Creators Update (16299)
Creators Update (15063)

Device form factor	Saw the problem?
Desktop	Yes
Xbox
Surface Hub
IoT

[lhak]

I have observed the same issue with the app not starting. In my case, setting PublishTrimmed to false in the Properties\PublishProfiles\win10-X.pubxml file fixed it.

[akanieski]

Running into the exact same problem as you list out above.