Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

dotnet build errror when starting a bot project (because it is being used by another process)

See original GitHub issue

Describe the bug

I’ve seen this a number of times now when switching between different bot projects. Bots start to report errors when starting due to the .exe being used by another process. bot project has only been launched as part of using Composer, VS hasn’t been opened against the csproj or anything outside composer.

Digging around in task manager it seems djbfskill6 had a process running in the background, Composer perhaps isn’t terminating these processes correctly in some instances?

Error occurred building the bot

Message:
Command failed: dotnet build djbfskill1.csproj
Command:
dotnet build djbfskill1.csproj
Stack Trace:
Error: Command failed: dotnet build djbfskill1.csproj

    at ChildProcess.exithandler (child_process.js:308:12)
    at ChildProcess.emit (events.js:210:5)
    at maybeClose (internal/child_process.js:1021:16)
    at Process.ChildProcess._handle.onexit (internal/child_process.js:283:5)
Output:
Microsoft (R) Build Engine version 16.9.0+57a23d249 for .NET
Copyright (C) Microsoft Corporation. All rights reserved.

  Determining projects to restore...
C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj : warning NU1701: Package 'Microsoft.Azure.KeyVault.Core 1.0.0' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8' instead of the project target framework '.NETCoreApp,Version=v3.1'. This package may not be fully compatible with your project.
  All projects are up-to-date for restore.
C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj : warning NU1701: Package 'Microsoft.Azure.KeyVault.Core 1.0.0' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8' instead of the project target framework '.NETCoreApp,Version=v3.1'. This package may not be fully compatible with your project.
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): warning MSB3026: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Beginning retry 1 in 1000ms. The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): warning MSB3026: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Beginning retry 2 in 1000ms. The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): warning MSB3026: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Beginning retry 3 in 1000ms. The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): warning MSB3026: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Beginning retry 4 in 1000ms. The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): warning MSB3026: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Beginning retry 5 in 1000ms. The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): warning MSB3026: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Beginning retry 6 in 1000ms. The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): warning MSB3026: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Beginning retry 7 in 1000ms. The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): warning MSB3026: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Beginning retry 8 in 1000ms. The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): warning MSB3026: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Beginning retry 9 in 1000ms. The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): warning MSB3026: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Beginning retry 10 in 1000ms. The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): error MSB3027: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Exceeded retry count of 10. Failed.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): error MSB3021: Unable to copy file "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process. [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]

Build FAILED.

C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj : warning NU1701: Package 'Microsoft.Azure.KeyVault.Core 1.0.0' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8' instead of the project target framework '.NETCoreApp,Version=v3.1'. This package may not be fully compatible with your project.
C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj : warning NU1701: Package 'Microsoft.Azure.KeyVault.Core 1.0.0' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8' instead of the project target framework '.NETCoreApp,Version=v3.1'. This package may not be fully compatible with your project.
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): warning MSB3026: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Beginning retry 1 in 1000ms. The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): warning MSB3026: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Beginning retry 2 in 1000ms. The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): warning MSB3026: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Beginning retry 3 in 1000ms. The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): warning MSB3026: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Beginning retry 4 in 1000ms. The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): warning MSB3026: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Beginning retry 5 in 1000ms. The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): warning MSB3026: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Beginning retry 6 in 1000ms. The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): warning MSB3026: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Beginning retry 7 in 1000ms. The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): warning MSB3026: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Beginning retry 8 in 1000ms. The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): warning MSB3026: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Beginning retry 9 in 1000ms. The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): warning MSB3026: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Beginning retry 10 in 1000ms. The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): error MSB3027: Could not copy "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". Exceeded retry count of 10. Failed.  [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]
C:\Program Files\dotnet\sdk\5.0.201\Microsoft.Common.CurrentVersion.targets(4919,5): error MSB3021: Unable to copy file "C:\Users\darrenj\djbfskill1\djbfskill1\obj\Debug\netcoreapp3.1\apphost.exe" to "bin\Debug\netcoreapp3.1\djbfskill1.exe". The process cannot access the file 'C:\Users\darrenj\djbfskill1\djbfskill1\bin\Debug\netcoreapp3.1\djbfskill1.exe' because it is being used by another process. [C:\Users\darrenj\djbfskill1\djbfskill1\djbfskill1.csproj]

Version

1.4.0-nightly.237101

Browser

Electron distribution
Chrome
Safari
Firefox
Edge

OS

macOS
Windows
Ubuntu

Issue Analytics

State:
Created 2 years ago
Comments:18 (17 by maintainers)

Top GitHub Comments

1reaction

boydc2014commented, Jun 17, 2021

I spiked out a PoC of a mechanism that would allow the Electron main process to wait for asynchronous cleanup tasks on the renderer process before shutting down.

You can find the source here.

Now it’s just a matter of deciding whether it’s something we want to use or modify and then porting it over to Composer. We would then be able to wait for running bots to be shut down by this mechanism before closing Composer.

Awesome demo of the POC, it looks very promising. In terms of timeline, at this moment i don’t think we have resource to include this in R14, what do you think? How about we move this to R15?

1reaction

sgellockcommented, May 10, 2021

Shiproom - we’ve fixed some of these scenarios. At this point, I’m moving this out of R13 for consideration in a post build release

Top Results From Across the Web

Build error: "The process cannot access the file because it is ...

The process cannot access the file "bin\Debug\MyProject.exe" because it is being used by another process. Googling the error doesn't come up ...

Can't run tests. dll being used by another process

I added a test project to my ASP.NET Core 1.1 app and I can't build now because the app dll is being used...

dotnet/runtime - Gitter

IOException: The process cannot access the file '/app/build/Foo.deps.json' because it is being used by another process. in a docker build process is ...

dotnet build command - .NET CLI | Microsoft Learn

The dotnet build command builds a project and all of its dependencies.

Solution: The Process Can Not Access The File Because It Is ...

The main cause for this error is because the port is already being used by another project. The error code 0x80070020 means ...