when I try to get the Wallet address Using a web Browser, By clicking on REQUEST. I get this error :
But when I Use The Mobile app Everything goes okay.
If it is working OK using their mobile app (and/or the browser on your mobile)... it's likely something causing a conflict with your web browser on your PC.
Browser extensions/plugins are often the cause of websites not working correctly. So try a different browser or temporarily disabling your plugins/extensions/adblockers etc. They might be interfering with the Javascript on blockchain.com.