Problems with Visual Studio compiling website projects

How to troubleshoot cannot update project reference issues when Visual Studio compiles a website project

The scenario where the problem occurs:

1. Version of Visual Studio: Visual Studio 2012

2. The Web project type is WebSite, not a Web application

3. The Visual Studio project referenced by the WEB project was deleted or unloaded (Unload)

Detailed error message:

Error 124 cannot update project reference '. Source Project not available.

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Workaround:

Open the solution file (. sln) in Notepad to find the projectreferences part of the corresponding WEB project

Projectsection (websiteproperties) = preproject
    Targetframeworkmoniker = ". netframework,version%3dv4.0 "
    projectreferences =" "

Change the value of the projectreferences to empty, add the required references, and compile, and the problem can be resolved.

RELATED links:

Improve "Cannot update project reference" for unloaded projects