some audio file(s) could not be found content file seems to

I reinstalled Cubase 4 and the update on a mac running 10.6.
When I try to load sounds into Halion, I get the error message:
some audio file(s) could not be found content file seems to be broken!
It worked fine prior to reinstallation on the same computer and OS.
How do I get the sounds back into Halion?
Thank you