Error EA39070A and backing up

I did a search for this topic but nothing came up for my problem.

 

I am running Norton Ghost 9.0 on my PC (Windows XP) to backup my C: drive on an external HD. I've have done so with no problems in the past. The last back-up was April 2009. However, this time Ghost worked almost all the way to to bitter end (22 minutes) when the this error message popped up:

 

Backup of c:\ did not complete successfully.

Error EA39070A: The internal structure od the PQI file is invalid or unsupported.

(0xEA39070A)

 

I don't know what this means and I don't know how to fix it. Can anyone help me?

 

Thanks.

Sonya