Hi @Mansour_Dalir,
Welcome to Microsoft Q&A!
Do you mean that it occurs in specific project?
Please try the following workarounds:
- Disable the installed extensions under Extensions > Manage Extensions > Installed to check if the installed extensions affect or not.
- You can delete the cache file of VS2019. Please close all Visual Studio instances and delete all files in the following folder: %localappdata%\Microsoft\VisualStudio\16.0_xxxx\ComponentModelCache. After removing it, please run your Visual Studio as administrator.
- Close all running VS instances and try to delete the hidden
.vs
folder in the project folder. - Repair your VS2019 with Visual Studio Installer > More > Repair.
- Update your VS2019 to the latest version.
Sincerely,
Anna
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