That is very interesting....
I have successfully exported my 'WMI' DeviceClass and am currently
uploading it to dropbox. I'll IM you the download link when it's done.
Here are the rough instructions for importing it:
1. Download 'WMI.zexp' and copy to the zenoss server
2. Move it to /opt/zenoss/import/
3. chown it to zenoss:zenoss
4. Browse to the URL I provided earlier, to where the WMI DeviceClass
should have been
5. Click Import/Export
6. At the bottom, select WMI.zexp and select Import, leaving the default
options alone
After that, I would restart zenoss, to ensure everything is working
cleanly, then try to reinstall the ZenPack!