[WebToolsE2E][Aspire] After installing Aspire 9.1, running a scaffolded Aspire 9.0 project failed and got some unreasonable error messages: Newer version of .NET Aspire workload is required to run the application. Run 'dotnet workload update' to get it.

[v-sherryfan]

INSTALL STEPS

1. Clean machine: Win11 x64 23h2
2. Install SDK 9.0.200
3. Install latest released Microsoft.dotnet-scaffold-aspire, version 9.0.1
4. Install Aspire 9.1.0
   • Apply aspire 9.1 Feed
5. Install Docker

REPRO STEPS

1. Open CMD, create an Aspire Starter App following commands:

dotnet new aspire-starter --aspire-version 9.0 -o Aspire01
cd Aspire01

2. Run dotnet scaffold in solution, according to wizard:
   • Pick a scaffolding category: Aspire
   • Pick a scaffolding command: Caching
   • Caching type: redis
   • Aspire App host project file: Aspire01.AppHost
   • Web or worker project file: Aspire01.Web
   • Include Prerelease packages: No
3. Run dotnet run in Aspire01.AppHost project

ACTUAL
Newer version of .NET Aspire workload is required to run the application. Run 'dotnet workload update' to get it.

Error Logs
fail: Microsoft.Extensions.Hosting.Internal.Host[11]
Hosting failed to start
Aspire.Hosting.DistributedApplicationException: Newer version of .NET Aspire workload is required to run the application. Run 'dotnet workload update' to get it.
at Aspire.Hosting.Dcp.DcpDependencyCheck.EnsureDcpVersion(DcpInfo dcpInfo) in //src/Aspire.Hosting/Dcp/DcpDependencyCheck.cs:line 162
at Aspire.Hosting.Dcp.DcpDependencyCheck.GetDcpInfoAsync(Boolean force, CancellationToken cancellationToken) in //src/Aspire.Hosting/Dcp/DcpDependencyCheck.cs:line 105
at Aspire.Hosting.Dcp.DcpDependencyCheck.GetDcpInfoAsync(Boolean force, CancellationToken cancellationToken) in //src/Aspire.Hosting/Dcp/DcpDependencyCheck.cs:line 127
at Aspire.Hosting.Dcp.DcpHost.EnsureDcpContainerRuntimeAsync(CancellationToken cancellationToken) in //src/Aspire.Hosting/Dcp/DcpHost.cs:line 64
at Aspire.Hosting.Dcp.DcpHost.StartAsync(CancellationToken cancellationToken) in //src/Aspire.Hosting/Dcp/DcpHost.cs:line 57
at Aspire.Hosting.Orchestrator.OrchestratorHostService.StartAsync(CancellationToken cancellationToken) in //src/Aspire.Hosting/Orchestrator/OrchestratorHostService.cs:line 39
at Microsoft.Extensions.Hosting.Internal.Host.b__14_1(IHostedService service, CancellationToken token)
at Microsoft.Extensions.Hosting.Internal.Host.ForeachService[T](IEnumerable1 services, CancellationToken token, Boolean concurrent, Boolean abortOnFirstException, List1 exceptions, Func`3 operation)
Unhandled exception. System.AggregateException: One or more errors occurred. (Newer version of .NET Aspire workload is required to run the application. Run 'dotnet workload update' to get it.)

EXPECTED
It shouldn't show anything like "dotnet workload update".

This should be good, Newer version of the Aspire.Hosting. AppHost package is required to run the application. Ensure you are referencing at least version.

[balachir]

@v-sherryfan I tried the scenario described in your issue. I'm consistently seeing the following error saying that the Aspire.Hosting.AppHost package needs to be updated to 9.1.0, which is a reasonable error message. Can you clarify how exactly you are getting the error message that you described? Did you have the correct feed applied for Aspire 9.1 candidate build?

Also, one more question - your screenshot shows that VS is involved but your install steps / repro steps do not mention installing VS. Can you clarify that as well?

cc: @v-elenafeng

[balachir]

@v-sherryfan fyi, I tried some scenarios on a machine with VS 17.13 too. I'm consistently seeing only the error that I included in my screenshot above - 'Newer version of Aspire.Hosting.AppHost is required', which is the correct error message. If you can figure out and let us know the exact case when you can get the 'Newer version of Aspire workload is required' error, that'll be helpful to know.

cc: @v-elenafeng

[eerhardt]

This is the problem. As the error message says - you need to update Aspire.Hosting.AppHost to 9.1.0.

[eerhardt]

Newer version of Aspire workload is required

This was message was updated with #7539 and ported to release/9.1 in #7566.

If you are still seeing that error message, clean your nuget cache and ensure you are using the latest 9.1 build. There shouldn't be error messages referencing "workload" anymore.

[v-sherryfan]

@eerhardt Thank you for your help. After cleaning the nuget cache, I tried this issue again and got the following reasonable error message as we expected.

cc: / @balachir

[eerhardt]

Closing as this is behaving as expected.