Hi Ajitha,
Try downloading the project from the Developer Portal by following these steps:
Log in to your Mendix account.
Go to the Apps section.
Click on your app.
Click the Edit in Studio Pro button.
This will initiate the downloading process.
Select the correct branch line and download it.
Hi, you can go to log directory to view the log files for better diagnostic. If your network sits behinds a proxy, it might also cause this issue.