Hi @Abhijit ,
Welcome to Microsoft Q&A!
what is your project type? And how did you open the project? Can you successfully create a new project with VS2019?
Please restart your computer, then, launch your VS2019 and select Open a project or solution on the start window. You can browse to your project and select it to open the project.
Besides, you can check if you have anti-virus software or other third-party processes enabled. If so, please temporarily disable them in task manager.
Sincerely,
Anna
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