Have you tried restarting your pc and/or redownloading the repository?
Hey Samnang,
Please try closing the app explorer and re-opening it.
If that doesn't work, you can try going to preferences > new features and turning off the new app explorer.
After that, if you restart Studio Pro, it can work again
Hi, Uninstall that version of Mendix and re-install it to see if anything has been missed while setting up Studio Pro.