After Update VS 2022 v 17.14.5 Blazor App, Web API Not run

[vsfeedback]

This issue has been moved from a ticket on Developer Community.

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[regression] [worked-in:17.14.4]
if make new project or existing project..!! come this message

The "DefineStaticWebAssetEndpoints" task failed unexpectedly.
System.AggregateException: One or more errors occurred. ---> System.InvalidOperationException: Last write time for 'C:\Users\it_de\source\repos\BlazorApp14\BlazorApp14\BlazorApp14.Client\wwwroot\appsettings.json' is not defined.
at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.Validate()
at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.FromTaskItem(ITaskItem item)
at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.ParallelWorker.Process(Int32 i, ParallelLoopState _)
at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.<>c.<Execute>b__16_2(Int32 i, ParallelLoopState loop, ParallelWorker state)
at System.Threading.Tasks.Parallel.<>c__DisplayClass17_01.<ForWorker>b__1() at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask) at System.Threading.Tasks.Task.<>c__DisplayClass176_0.<ExecuteSelfReplicating>b__0(Object <p0>) --- End of inner exception stack trace --- at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions) at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken) at System.Threading.Tasks.Parallel.ForWorker[TLocal](Int32 fromInclusive, Int32 toExclusive, ParallelOptions parallelOptions, Action1 body, Action2 bodyWithState, Func4 bodyWithLocal, Func1 localInit, Action1 localFinally)
at System.Threading.Tasks.Parallel.For[TLocal](Int32 fromInclusive, Int32 toExclusive, Func1 localInit, Func4 body, Action1 localFinally) at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.Execute() at Microsoft.Build.BackEnd.TaskExecutionHost.Execute() at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext() ---> (Inner Exception #0) System.InvalidOperationException: Last write time for 'C:\Users\it_de\source\repos\BlazorApp14\BlazorApp14\BlazorApp14.Client\wwwroot\appsettings.json' is not defined. at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.Validate() at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.FromTaskItem(ITaskItem item) at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.ParallelWorker.Process(Int32 i, ParallelLoopState _) at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.<>c.<Execute>b__16_2(Int32 i, ParallelLoopState loop, ParallelWorker state) at System.Threading.Tasks.Parallel.<>c__DisplayClass17_01.<ForWorker>b__1()
at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
at System.Threading.Tasks.Task.<>c__DisplayClass176_0.<ExecuteSelfReplicating>b__0(Object <p0>)<---

---> (Inner Exception #1) System.InvalidOperationException: Last write time for 'C:\Users\it_de\source\repos\BlazorApp14\BlazorApp14\BlazorApp14.Client\wwwroot\appsettings.Development.json' is not defined.
at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.Validate()
at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.FromTaskItem(ITaskItem item)
at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.ParallelWorker.Process(Int32 i, ParallelLoopState _)
at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.<>c.<Execute>b__16_2(Int32 i, ParallelLoopState loop, ParallelWorker state)
at System.Threading.Tasks.Parallel.<>c__DisplayClass17_0`1.<ForWorker>b__1()
at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
at System.Threading.Tasks.Task.<>c__DisplayClass176_0.<ExecuteSelfReplicating>b__0(Object <p0>)<---

The "DefineStaticWebAssetEndpoints" task failed unexpectedly.
System.AggregateException: One or more errors occurred. ---> System.InvalidOperationException: Last write time for 'C:\Users\it_de\source\repos\BlazorApp14\BlazorApp14\BlazorApp14\wwwroot\lib\bootstrap\dist\css\bootstrap-reboot.css' is not defined.
at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.Validate()
at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.FromTaskItem(ITaskItem item)
at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.ParallelWorker.Process(Int32 i, ParallelLoopState _)
at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.<>c.<Execute>b__16_2(Int32 i, ParallelLoopState loop, ParallelWorker state)
at System.Threading.Tasks.Parallel.<>c__DisplayClass17_01.<ForWorker>b__1() at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask) at System.Threading.Tasks.Task.<>c__DisplayClass176_0.<ExecuteSelfReplicating>b__0(Object <p0>) --- End of inner exception stack trace --- at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions) at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken) at System.Threading.Tasks.Parallel.ForWorker[TLocal](Int32 fromInclusive, Int32 toExclusive, ParallelOptions parallelOptions, Action1 body, Action2 bodyWithState, Func4 bodyWithLocal, Func1 localInit, Action1 localFinally)
at System.Threading.Tasks.Parallel.For[TLocal](Int32 fromInclusive, Int32 toExclusive, Func1 localInit, Func4 body, Action1 localFinally) at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.Execute() at Microsoft.Build.BackEnd.TaskExecutionHost.Execute() at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext() ---> (Inner Exception #0) System.InvalidOperationException: Last write time for 'C:\Users\it_de\source\repos\BlazorApp14\BlazorApp14\BlazorApp14\wwwroot\lib\bootstrap\dist\css\bootstrap-reboot.css' is not defined. at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.Validate() at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.FromTaskItem(ITaskItem item) at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.ParallelWorker.Process(Int32 i, ParallelLoopState _) at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.<>c.<Execute>b__16_2(Int32 i, ParallelLoopState loop, ParallelWorker state) at System.Threading.Tasks.Parallel.<>c__DisplayClass17_01.<ForWorker>b__1()
at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
at System.Threading.Tasks.Task.<>c__DisplayClass176_0.<ExecuteSelfReplicating>b__0(Object <p0>)<---

---> (Inner Exception #1) System.InvalidOperationException: Last write time for 'C:\Users\it_de\source\repos\BlazorApp14\BlazorApp14\BlazorApp14\wwwroot\lib\bootstrap\dist\css\bootstrap.rtl.css' is not defined.
at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.Validate()
at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.FromTaskItem(ITaskItem item)
at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.ParallelWorker.Process(Int32 i, ParallelLoopState _)
at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.<>c.<Execute>b__16_2(Int32 i, ParallelLoopState loop, ParallelWorker state)
at System.Threading.Tasks.Parallel.<>c__DisplayClass17_0`1.<ForWorker>b__1()
at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
at System.Threading.Tasks.Task.<>c__DisplayClass176_0.<ExecuteSelfReplicating>b__0(Object <p0>)<---

---> (Inner Exception #2) System.InvalidOperationException: Last write time for 'C:\Users\it_de\source\repos\BlazorApp14\BlazorApp14\BlazorApp14\wwwroot\lib\bootstrap\dist\css\bootstrap-utilities.min.css' is not defined.
at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.Validate()
at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.FromTaskItem(ITaskItem item)
at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.ParallelWorker.Process(Int32 i, ParallelLoopState _)
at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.<>c.<Execute>b__16_2(Int32 i, ParallelLoopState loop, ParallelWorker state)
at System.Threading.Tasks.Parallel.<>c__DisplayClass17_0`1.<ForWorker>b__1()
at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
at System.Threading.Tasks.Task.<>c__DisplayClass176_0.<ExecuteSelfReplicating>b__0(Object <p0>)<---

---> (Inner Exception #3) System.InvalidOperationException: Last write time for 'C:\Users\it_de\source\repos\BlazorApp14\BlazorApp14\BlazorApp14\wwwroot\lib\bootstrap\dist\css\bootstrap-utilities.rtl.min.css.map' is not defined.
at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.Validate()
at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.FromTaskItem(ITaskItem item)
at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.ParallelWorker.Process(Int32 i, ParallelLoopState _)
at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.<>c.<Execute>b__16_2(Int32 i, ParallelLoopState loop, ParallelWorker state)
at System.Threading.Tasks.Parallel.<>c__DisplayClass17_0`1.<ForWorker>b__1()
at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
at System.Threading.Tasks.Task.<>c__DisplayClass176_0.<ExecuteSelfReplicating>b__0(Object <p0>)<---

---> (Inner Exception #4) System.InvalidOperationException: Last write time for 'C:\Users\it_de\source\repos\BlazorApp14\BlazorApp14\BlazorApp14\wwwroot\lib\bootstrap\dist\css\bootstrap-reboot.rtl.css.map' is not defined.
at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.Validate()
at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.FromTaskItem(ITaskItem item)
at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.ParallelWorker.Process(Int32 i, ParallelLoopState _)
at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.<>c.<Execute>b__16_2(Int32 i, ParallelLoopState loop, ParallelWorker state)
at System.Threading.Tasks.Parallel.<>c__DisplayClass17_0`1.<ForWorker>b__1()
at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
at System.Threading.Tasks.Task.<>c__DisplayClass176_0.<ExecuteSelfReplicating>b__0(Object <p0>)<---

---> (Inner Exception #5) System.InvalidOperationException: Last write time for 'C:\Users\it_de\source\repos\BlazorApp14\BlazorApp14\BlazorApp14\wwwroot\app.css' is not defined.
at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.Validate()
at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.FromTaskItem(ITaskItem item)
at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.ParallelWorker.Process(Int32 i, ParallelLoopState _)
at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.<>c.<Execute>b__16_2(Int32 i, ParallelLoopState loop, ParallelWorker state)
at System.Threading.Tasks.Parallel.<>c__DisplayClass17_0`1.<ForWorker>b__1()
at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
at System.Threading.Tasks.Task.<>c__DisplayClass176_0.<ExecuteSelfReplicating>b__0(Object <p0>)<---

---> (Inner Exception #6) System.InvalidOperationException: Last write time for 'C:\Users\it_de\source\repos\BlazorApp14\BlazorApp14\BlazorApp14\wwwroot\lib\bootstrap\dist\css\bootstrap-grid.min.css.map' is not defined.
at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.Validate()
at Microsoft.AspNetCore.StaticWebAssets.Tasks.StaticWebAsset.FromTaskItem(ITaskItem item)
at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.ParallelWorker.Process(Int32 i, ParallelLoopState _)
at Microsoft.AspNetCore.StaticWebAssets.Tasks.DefineStaticWebAssetEndpoints.<>c.<Execute>b__16_2(Int32 i, ParallelLoopState loop, ParallelWorker state)
at System.Threading.Tasks.Parallel.<>c__DisplayClass17_0`1.<ForWorker>b__1()
at System.Threading.Tasks.Task.InnerInvokeWithArg(Task childTask)
at System.Threading.Tasks.Task.<>c__DisplayClass176_0.<ExecuteSelfReplicating>b__0(Object <p0>)<---

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Original Comments

Feedback Bot on 6/18/2025, 06:10 AM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

[javiercn]

Thanks for contacting us.

We believe this issue was addressed in the 9.0.302 SDK, could you please give that a try and let us know if that fixes your issue?

If not, could you provide us with a binary log to help us investigate?
For Visual Studio, set the following environment variables and launch visual studio, the logs will be in the folder

SET MSBUILDDEBUGENGINE=1
SET MSBUILDDEBUGPATH=C:\MSBuildReproLogs

From the command line use dotnet build /bl to capture the binlog.

[dotnet-policy-service]

Hi @@vsfeedback. We have added the "Needs: Author Feedback" label to this issue, which indicates that we have an open question for you before we can take further action. This issue will be closed automatically in 7 days if we do not hear back from you by then - please feel free to re-open it if you come back to this issue after that time.