Excerpt from Spotlight on RAC version 1.0.2 Release Notes [see release notes attached]:
The following server operating systems are supported for OS Server queries:
. HP-UX: 11, 11i, 11i v2.
. Solaris: 8, 9, 10.
. AIX: 5.1, 5.2, 5.3.
. Red Hat and SUSE operating systems running Linux 2.4 and 2.6 kernels.
Spotlight on RAC 1.0.2 does not support Oracle clusters running on Windows servers."
Upgrading to Spotlight on RAC version 1.1 resolves this issue as the release of Spotlight on RAC version 1.1 is primarily designed to provide OS support for Windows clusters.