gtar: permission denied

[Ysean]

I'm trying to re-install an app vault script for a client which has data already in it... I am getting the following error. I've checked permissions and /bin/gtar and /bin/tar are both world executable. Any ideas?

sappmng: /bin/gtar execution failed: /bin/gtar: ./g2data/sessions/index.html: Cannot open: Permission denied /bin/gtar: Error exit delayed from previous errors sappmng: Application files extraction failed