Hi Anu,
Thank you very much for your question and I am very sorry for the issue!
I believe Carpet Area is not one of the default parameter, but a custom one. Could you share with us the file your are working on for further investigation? Please let me know if you'll need a secure place to upload your file.
Looking forward to hearing from you!
Best regards,
Minh
Minh Nguyen
Technical Support Engineer
GRAPHISOFT