hey Mubasshir.

it seems like this error we didn't encounter it before, perhaps you can provide us with your Joomla backend and FTP access so we can help you check on this?

And provide us more info how to replicate this error as well?

By the way, please remember to assign your domain to your license to obtain for support in the future. You can do so by accessing your license area at http://stackideas.com/dashboard