The reason you are getting this error is because you do not have an exe file in your netcoreapp folder. Try and create a new project called HelloWorld1 and if VS19 doesn't create the files, you will need to uninstall and reinstall the application.

I tried multiple solutions for many days, but the only thing that worked for me was completely removing VS 2019 and then re-installing.

To solve your problem, you need to start a VS2019 as administrator and with this the project build will work normally.

Note: In my case the vs2019 is professional.

For me, all I needed to do was modify the Project Properties (right click the project in the Solution Explorer --> Project Properties), then under the Application tab, select an appropriate Target Framework. It was unset for me by default.

Simple answer: Install .NET Core cross-platform development from the Visual Studio Installer in the Workloads tab. Totally working and tested here :)

For me, a wrong -path in the projectname.csproj.user was the problem. This drive me nuts! After deleting this file and rebuild the project, it finally worked.

I had a duplicate .AssemblyInfo.cs file within my project (one in the bin folder and one outside). This file is auto generated so what I did was removed both files, cleaned the project, ran a restore and then a rebuild. Fixed my issue.

I fixed it by right clicking the project, then "unload project", then right clicking again, then "reload project". Then running the project again and the error should be gone, at least for me

I have changed my solution name, it occurs this error. Then I changed all using packagename to correct one, then rebuild it. It works correctly.

1. Check the output path of project (Project > right click Properties > Build > Output path)
2. Go to Build menu > Configuration Manager. Check the myMLApp has "Build" checked
3. Clean solution. Build solution.

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Solution for Azure Functions

1. Make sure you have azure-functions-core-tools installed.
2. Open up your project's properties, right-click project root | properties | Debug You should see this:
3. Set the Launch to Executable
4. Set the Executable to the path of your azure-functions-core-tools executable - in AppData\Roaming\npm\node_modules\azure-functions-core-tools\bin\func.exe

So.... I’m using visual studio 2019 (version 16.10.2) on a windows 10. What fixed the issue for me were:

1. Start a new project
2. On the menu titled “Configure your new Project” I unchecked the option that says “place solution and project in the same directory”, then click next
3. On the menu titled “Addition information”, I selected the current target framework which was “.Net5.0(Current)”, then click create.

Bamn!!! Fixed

I had this problem very recently with a fresh installation of visual studio 2022. The error occurred when I attempted to run a project with the 5.0 DotNet Framework specified instead of the default which was 6.0. I fixed the issue by modifying my installation with the installer and manually selecting DotNet 5.0 Framework to be installed because apparently it is not installed by default and only 6.0 is. The error message wasn't in the least bit helpful at telling me what I had to do. But after that everything runs without error.

Copy the "cli" folder and rename it to "cli_x64". This works for me.