Hi @LO TAURO REBECCA ,
Welcome to Microsoft Q&A!
Which version of Visual Studio are you using? What is your project type? Please share us more details in order for us to repro it.
You can try the following workaround:
- Close all instances of Visual Studio
- Launch the Visual Studio Installer and Update your Visual Studio to the latest version
- Launch the VS and rebuild your solution
If it doesn’t work, please create a new project and verify if the same situation appears in other projects or not.
Sincerely,
Anna
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