Application Vault not loading

[pould]

I get the following error when trying to get into the application vault:

---
Error: /usr/local/psa/var/apspkgarc/archive-index.xml:1: parser error : Document is empty

^
/usr/local/psa/var/apspkgarc/archive-index.xml:1: parser error : Start tag expected, '<' not found

^
Unexpected error
---

Updater reports it as correctly installed. Is there perhaps a way to completely uninstall it and that reinstall?

I am runnin 9.0.1 on Centos 5

Peter O