Stride appears to assume that no nuget package source will be authenticated and falls over when encountering one.

This is not a priority issue as there is a workaround, just submitting the bug report to help anyone else that encounters this issue and to record its existence. This is also a decent candidate for a fix for any new contributors.

Release Type: Official Release

Version: 4.2.0.2067

Platform(s): Windows

Describe the bug
When attempting to create a new project from a template (actually some other operations appear to also fail in this way), if any nuget repository specified in the global config (typically found at: %appdata%\NuGet\NuGet.Config) is not publicly accessible the template will fail half way through and bail leaving the newly created project in an incomplete state.

To Reproduce
Steps to reproduce the behavior:

1. Add a nuget repository that is password protected to the global nuget config (%appdata%\NuGet\NuGet.Config on windows)
2. Attempt to create a new template

Expected behavior
Exception handling and ignoring any invalid/authenticated package sources specified in global config.

Log
Verbose: Process dependencies for JumpyJet.Game...
Info: Upgrading project [JumpyJet.Game] to use [Stride.Core] from version [4.1.0.1-beta] to [4.2.0.2067] will be required
Verbose: Restore NuGet packages for JumpyJet.Game...
[C:\Program Files\dotnet\sdk\8.0.100\NuGet.targets(156,5)]: Error: Unable to load the service index for source [URL-TO-PRIVATE-WORK-NUGET-REMOVED].
Response status code does not indicate success: 401 (Unauthorized).
[C:\Program Files\dotnet\sdk\8.0.100\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(266,5)]: Error: Assets file 'F:\GameDev\sandbox\JumpyJet\JumpyJet.Game\obj\project.assets.json' not found. Run a NuGet package restore to generate this file.
[C:\Program Files\dotnet\sdk\8.0.100\NuGet.targets(156,5)]: Error: Unable to build assembly reference [F:\GameDev\sandbox\JumpyJet\JumpyJet.Game\bin\Debug\net8.0\JumpyJet.Game.dll]
[C:\Program Files\dotnet\sdk\8.0.100\NuGet.targets(156,5)]: Verbose: Loading Assets from Package [JumpyJet.Game.sdpkg]
Warning: Could not deserialize object of type 'JumpyJet.UIScript'; replacing it with an object implementing IUnloadable
YamlException: Unable to resolve tag [!JumpyJet.UIScript,JumpyJet.Game] to type from tag resolution or registered assemblies ((Lin: 24, Col: 54, Chr: 1016) -> (Lin: 25, Col: 24, Chr: 1074))
at Stride.Core.Yaml.Serialization.Serializers.TagTypeSerializer.ReadYaml(ObjectContext& objectContext) in C:\BuildAgent\work\b5f46e3c4829a09e\sources\core\Stride.Core.Yaml\Serialization\Serializers\TagTypeSerializer.cs:line 81
at Stride.Core.Yaml.ErrorRecoverySerializer.ReadYaml(ObjectContext& objectContext) in C:\BuildAgent\work\b5f46e3c4829a09e\sources\assets\Stride.Core.Assets\Yaml\ErrorRecoverySerializer.cs:line 50

Warning: Could not deserialize object of type 'JumpyJet.CharacterScript'; replacing it with an object implementing IUnloadable
YamlException: Unable to resolve tag [!JumpyJet.CharacterScript,JumpyJet.Game] to type from tag resolution or registered assemblies ((Lin: 23, Col: 54, Chr: 1099) -> (Lin: 24, Col: 24, Chr: 1164))
at Stride.Core.Yaml.Serialization.Serializers.TagTypeSerializer.ReadYaml(ObjectContext& objectContext) in C:\BuildAgent\work\b5f46e3c4829a09e\sources\core\Stride.Core.Yaml\Serialization\Serializers\TagTypeSerializer.cs:line 81
at Stride.Core.Yaml.ErrorRecoverySerializer.ReadYaml(ObjectContext& objectContext) in C:\BuildAgent\work\b5f46e3c4829a09e\sources\assets\Stride.Core.Assets\Yaml\ErrorRecoverySerializer.cs:line 50

Warning: Could not deserialize object of type 'JumpyJet.BackgroundScript'; replacing it with an object implementing IUnloadable
YamlException: Unable to resolve tag [!JumpyJet.BackgroundScript,JumpyJet.Game] to type from tag resolution or registered assemblies ((Lin: 62, Col: 54, Chr: 3133) -> (Lin: 63, Col: 24, Chr: 3199))
at Stride.Core.Yaml.Serialization.Serializers.TagTypeSerializer.ReadYaml(ObjectContext& objectContext) in C:\BuildAgent\work\b5f46e3c4829a09e\sources\core\Stride.Core.Yaml\Serialization\Serializers\TagTypeSerializer.cs:line 81
at Stride.Core.Yaml.ErrorRecoverySerializer.ReadYaml(ObjectContext& objectContext) in C:\BuildAgent\work\b5f46e3c4829a09e\sources\assets\Stride.Core.Assets\Yaml\ErrorRecoverySerializer.cs:line 50

Warning: Could not deserialize object of type 'JumpyJet.PipesScript'; replacing it with an object implementing IUnloadable
YamlException: Unable to resolve tag [!JumpyJet.PipesScript,JumpyJet.Game] to type from tag resolution or registered assemblies ((Lin: 87, Col: 54, Chr: 4503) -> (Lin: 88, Col: 24, Chr: 4564))
at Stride.Core.Yaml.Serialization.Serializers.TagTypeSerializer.ReadYaml(ObjectContext& objectContext) in C:\BuildAgent\work\b5f46e3c4829a09e\sources\core\Stride.Core.Yaml\Serialization\Serializers\TagTypeSerializer.cs:line 81
at Stride.Core.Yaml.ErrorRecoverySerializer.ReadYaml(ObjectContext& objectContext) in C:\BuildAgent\work\b5f46e3c4829a09e\sources\assets\Stride.Core.Assets\Yaml\ErrorRecoverySerializer.cs:line 50

Warning: Could not deserialize object of type 'JumpyJet.CharacterScript'; replacing it with an object implementing IUnloadable
YamlException: Unable to resolve tag [!JumpyJet.CharacterScript,JumpyJet.Game] to type from tag resolution or registered assemblies ((Lin: 105, Col: 54, Chr: 5593) -> (Lin: 106, Col: 24, Chr: 5658))
at Stride.Core.Yaml.Serialization.Serializers.TagTypeSerializer.ReadYaml(ObjectContext& objectContext) in C:\BuildAgent\work\b5f46e3c4829a09e\sources\core\Stride.Core.Yaml\Serialization\Serializers\TagTypeSerializer.cs:line 81
at Stride.Core.Yaml.ErrorRecoverySerializer.ReadYaml(ObjectContext& objectContext) in C:\BuildAgent\work\b5f46e3c4829a09e\sources\assets\Stride.Core.Assets\Yaml\ErrorRecoverySerializer.cs:line 50

Warning: Could not deserialize object of type 'JumpyJet.JumpyJetRenderer'; replacing it with an object implementing IUnloadable
YamlException: Unable to resolve tag [!JumpyJet.JumpyJetRenderer,JumpyJet.Game] to type from tag resolution or registered assemblies ((Lin: 103, Col: 12, Chr: 6262) -> (Lin: 104, Col: 8, Chr: 6312))
at Stride.Core.Yaml.Serialization.Serializers.TagTypeSerializer.ReadYaml(ObjectContext& objectContext) in C:\BuildAgent\work\b5f46e3c4829a09e\sources\core\Stride.Core.Yaml\Serialization\Serializers\TagTypeSerializer.cs:line 81
at Stride.Core.Yaml.ErrorRecoverySerializer.ReadYaml(ObjectContext& objectContext) in C:\BuildAgent\work\b5f46e3c4829a09e\sources\assets\Stride.Core.Assets\Yaml\ErrorRecoverySerializer.cs:line 50

[C:\Program Files\dotnet\sdk\8.0.100\NuGet.targets(156,5)]: Error: An exception occurred while generating the template.
InvalidOperationException: Unable to find the base [DefaultGraphicsCompositorLevel9] of asset [GraphicsCompositor].
at Stride.Core.Assets.Quantum.AssetPropertyGraph.RefreshBase() in C:\BuildAgent\work\b5f46e3c4829a09e\sources\assets\Stride.Core.Assets.Quantum\AssetPropertyGraph.cs:line 194
at Stride.Core.Assets.Editor.Components.TemplateDescriptions.SessionTemplateGenerator.ApplyMetadata(SessionTemplateGeneratorParameters parameters) in C:\BuildAgent\work\b5f46e3c4829a09e\sources\editor\Stride.Core.Assets.Editor\Components\TemplateDescriptions\SessionTemplateGenerator.cs:line 93
at Stride.Assets.Presentation.Templates.TemplateSampleGenerator.Generate(SessionTemplateGeneratorParameters parameters) in C:\BuildAgent\work\b5f46e3c4829a09e\sources\editor\Stride.Assets.Presentation\Templates\TemplateSampleGenerator.cs:line 258
at Stride.Core.Assets.Editor.Components.TemplateDescriptions.SessionTemplateGenerator.Run(SessionTemplateGeneratorParameters parameters) in C:\BuildAgent\work\b5f46e3c4829a09e\sources\editor\Stride.Core.Assets.Editor\Components\TemplateDescriptions\SessionTemplateGenerator.cs:line 41
at Stride.Core.Assets.Editor.Components.TemplateDescriptions.TemplateGeneratorHelper.<>c__DisplayClass0_0`1.b__0() in C:\BuildAgent\work\b5f46e3c4829a09e\sources\editor\Stride.Core.Assets.Editor\Components\TemplateDescriptions\TemplateGeneratorHelper.cs:line 56

Workaround
Disable/comment out authenticated package sources from the global nuget config when working on stride.

Start at the template-generation entry points named in the log: Stride.Core.Assets.Editor/Components/TemplateDescriptions/SessionTemplateGenerator.cs and TemplateGeneratorHelper.cs, then reproduce the failure with an authenticated source in the global NuGet.Config. Trace how package-restore errors reach template generation and verify that an inaccessible source no longer leaves the generated project incomplete.