Could not open workspace file of Xcode

Question

When I am open my project in Xcode. it's not open. Display following alert.

I also delete the project.xcworkspace file and create new scheme for this project. so that it can be open. but when I am shut down or restart my pc and then once again open the project, it's not opening and display following alert with some error.

so please tell me how to solve this error.

Answer 1

Open go the project directory and directly right click and open the .xcworkspace it will open

Answer 2

Close Xcode and restart you mac. Then open Xcode project again. It will work.