Hi Prasanna, Version control → Upload to version control server when trying to create or open a new Mendix application, it typically means that the app hasn’t been uploaded (committed) to the Mendix Team Server yet, and version control is not fully initialized.
Complete the Initial Upload to Version Control
Go to Version Control in the top menu.
Select Upload to Version Control Server.
Choose the appropriate Team Server project or create a new one.
Fill in the commit message and confirm.
Mendix will now initialize Git or SVN (depending on your setup) and push the project to the Team Server.
Still not able to open the APP means unstable or missing internet connection is one of the most common reasons for this issue in Mendix. Ensure you're connected to the Stable internet.
I hope this one helps you! :)