"dotnet pack" does not build

According to the documentation (https://docs.microsoft.com/en-us/dotnet/core/tools/dotnet-pack) the command dotnet pack should first build the project, unless the option --no-build is specified.

I am using Github Actions to publish my nuget project. And in my yml after setting up the environment and checking out the code I run the command dotnet pack --configuration Release -o output, which worked fine before but after my latest changes (renaming files, no changes to the yml) it fails with

##[error]/opt/hostedtoolcache/dncs/3.1.101/x64/sdk/3.1.101/Sdks/NuGet.Build.Tasks.Pack/build/NuGet.Build.Tasks.Pack.targets(198,5): error NU5026: The file ‘/home/runner/work/IvanStoychev.StringExtensions/IvanStoychev.StringExtensions/IvanStoychev.StringExtensions/bin/Release/netcoreapp3.0/IvanStoychev.StringExtensions.dll’ to be packed was not found on disk.

If I were to place a dotnet build command before the packing - it works fine.

[egeaydin]

I know this is an older issue but if someone is still having the same issue this worked for me: https://steveellwoodnlc.medium.com/error-nu5026-the-file-to-be-packed-was-not-found-on-disk-18bfbc6be4a

Simply remove this from your csproj file if you have it: <GeneratePackageOnBuild>true</GeneratePackageOnBuild>

[emaung]

I can confirm that this issue also exists on my mac running dotnet 6.0.301. I have library projects with <GeneratePackageOnBuild>true</GeneratePackageOnBuild> set. Setting <GeneratePackageOnBuild>false</GeneratePackageOnBuild> fixes the problem as suggested by @AntonSmolkov