'error while extracting ports.txz'

I am attempting an installation of FreeBSD 9.0 on a virtual machine using VirtualBox. However, I am getting this error message during archive extraction:

Code:
Error while extracting ports.txz:
Can't create 'usr/ports/net/yate-devel/files/CVS/Root'

The image file I am using is FreeBSD-9.0-RELEASE-i386-disc1.iso. I have no previous experience with FreeBSD so any help would be appreciated. More information will be provided if needed. Also I tried looking for a thread addressing a similar issue but didn't find anything.
 
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