.NET
Microsoft Technologies based on the .NET software framework.
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Delete the obj folder and then do a rebuild all
.NET standard dll is NOT generated all of sudden.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(38.4, 82%, 13%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ES%3C/text%3E%3C/svg%3E)
SmilingMoon
981
Reputation points
All of sudden, VS complains "Could not copy the file..."
Severity Code Description Project File Line Suppression State
Error MSB3030 Could not copy the file "obj\x64\Debug\netstandard2.0\Way.Standard.AppGeneral.dll" because it was not found. Way.Standard.AppGeneral C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\Current\Bin\Microsoft.Common.CurrentVersion.targets 4502
When I compile "Way.Standard.AppGeneral" project after changing source code by adding a blank,
compile succeed, but it doesn't generate ".dll" file.
2>SkyOnTheWay.Standard.AppGeneral -> D:\Projects\Way\BulkPhotoEditor-BR-Free\Way.Standard.AppGeneral\bin\x64\Debug\netstandard2.0\Way.Standard.AppGeneral.dll
2>Done building project "SkyOnTheWay.Standard.AppGeneral.csproj".
========== Rebuild All: 2 succeeded, 0 failed, 0 skipped ==========
However, "Way.Standard.AppGeneral.dll" is NOT generated in the folder "D:\Projects\Way\BulkPhotoEditor-BR-Free\Way.Standard.AppGeneral\bin\x64\Debug\netstandard2.0\".
All worked well until yesterday. Starting today, this started happen. There is no compile or any message with a clue.
Any idea?
.NET
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(233.6, 28.999999999999996%, 32%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EXZ%3C/text%3E%3C/svg%3E)
Xingyu Zhao-MSFT 5,356 Reputation points2022-01-21T01:56:34.013+00:00 Hi @SmilingMoon ,
Is "Way.Standard.AppGeneral" a class library project？
Please check the 'Output type' in your project 'Properties'. -
SmilingMoon 981 Reputation points
2022-01-21T07:23:04.01+00:00 Yes, it is Class Library.
It references Way.Standard.Toolkit .net standard library which has no issue.
Packages: NETStandard.Library (2.0.3) -
Xingyu Zhao-MSFT 5,356 Reputation points
2022-01-24T02:33:50.36+00:00 Hi @SmilingMoon ,
Thanks for your feedback.
Could you provide more details about the 'Way.Standard.Toolkit' .net standard library?
If you create a simple class library project, will a DLL be generated? -
SmilingMoon 981 Reputation points
2022-01-24T23:22:29.44+00:00 After two days of the issue, all of sudden it starts working fine.
I delete files output folder here and there, and tried again, but it didn't work, but all of sudden it starts working.This is very wired issue. Of course, there is no code change.
I don't think it's related to windows because other projects generated .dll files without an issue.
Also, there is no upgrade or reference or Nuget pck change.I close this for now until it happens again, which I don't want.
Thank you,
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1 answer
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Ken Tucker 5,846 Reputation points2022-01-21T01:45:35.49+00:00 -
SmilingMoon 981 Reputation points
2022-01-21T07:24:43.763+00:00 Thank you for comment.
I deleted obj folder and tried, deleted bin & obj folders and tried.
Delete entire solution folder and get latest again from Source Control and tried.
along with several restart PC.
None of them worked.This happens all of sudden.
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