This is what I had to do:

If you are using the 4.9 client with the NMAS components you need to
uninstall (not just disable) the NMAS components during the install. You
can uninstall them in add/remove programs.

You also need to delete the <servername>-ZIS objects first. wrote:
> Installed ZENworks Desktop management on five NetWare 6.5 SP1a servers.
> One server installed fine, the other four came up with this error in the
> installation log. Any Ideas?
> [*****]
> Pre-install steps completed successfully
> ZENworks Desktop Management files copied successfully.
> ZENworks Desktop Management startup files modified
> AOT files processed successfully
> Error: There was an error installing ZENworks Desktop Management on
> *****. Error: Failed to create imaging service object.