Error: Unable to Start Debugging on the Web Server. Error: Unable to. The new home for Visual Studio documentation is Visual Studio 2017 Documentation on. Sep 21, 2017  PDF files that contain the Visual Studio 2005 documentation. Try Microsoft Edge A fast and secure browser that. To start the download immediately.

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After installing the new Asp.net Core 1 Tooling preview to VS 2015, created a new project from the template for.NET Framework. When running the project (Start button or F5), received the old dreaded dialog 'Unable to start debugging. The startup project could not be launched.' The startup project is selected and bold. It was this way when the solution opened and right-click 'set' didn't help. Other facts & symptoms: • In the Debug menu, Start Debugging and Start without Debugging are both disabled. • The new project builds successfully.

• The command line 'dotnet run' works and the site can be navigated to. • Other projects still run in VS 2015 (both MVC & WPF) - they still work & can be run in debug. Homeworld community patch.

Only the new Core projects have this behavior. • Tried multiple new projects without success. The problem appears to be with the template or other elements of the Core tooling.

• Ran VS2015 as administrator and not, both have the same results. More facts & symptoms: • F12/Go to Definition didn't work for WebHostingBuilder or other new Core constructs.

• References is empty but Dependencies is full. Again, compiles & runs successfully using 'dotnet run'. • Was missing some patch, applied by way of the uninstall/change panel. The update didn't specify what version it was at or what it was going to. • Fully uninstalled tool preview, rebooted, reinstalled.

• Fully uninstalled & reinstalled Visual Studio & Tools preview, then reinstalled VS & Tools preview. Emptied%temp% along the way.

Attached logs on reinstall as a zip. More facts & symptoms: • F12/Go to Definition didn't work for WebHostingBuilder or other new Core constructs. • References is empty but Dependencies is full. Again, compiles & runs successfully using 'dotnet run'. • Was missing some patch, applied by way of the uninstall/change panel.

The update didn't specify what version it was at or what it was going to. • Fully uninstalled tool preview, rebooted, reinstalled. • Fully uninstalled & reinstalled Visual Studio & Tools preview, then reinstalled VS & Tools preview. Emptied%temp% along the way. Attached logs on reinstall as a zip.

“If build is working, are you seeing build output in the Output window?” • I see what looks like standard output with ‘Build’: 1>------ Rebuild All started: Project: HelloWebFull, Configuration: Debug Any CPU ------ 1> C: Program Files dotnet dotnet.exe build 'C: Projects_Testing cli-samples-master HelloWebFull' --configuration Debug --no-dependencies --no-incremental 1> Project HelloWebFull (.NETFramework,Version=v4.5.1) will be compiled because project is not safe for incremental compilation. Use --build-profile flag for more information. 1> Compiling HelloWebFull for.NETFramework,Version=v4.5.1 1> Compilation succeeded. 1> 0 Warning(s) 1> 0 Error(s) 1> Time elapsed 00:388 1> (The compilation time can be improved. Run 'dotnet build --build-profile' for more information) ========== Rebuild All: 1 succeeded, 0 failed, 0 skipped ========== “What's in the 'Show output from:' dropdown in the Output window?” • Only Build & Build Order while in Safe Mode.