Help me with this error wmi task

i set up a WMI Reader Task which works perfectly fine.

But when i Use WMI event watcher i get this error.

if the problem is with access rights how do i need to set or how can i figure out if i have rights..

[WMI Event Watcher Task] Error: Watching for the Wql query caused the following system exception: "Invalid class". Check the query for errors or WMI connection for access rights/permissions.

What is the WQL query you are trying to execute and on what OS/architechture? Some WMI classes are available on Vista, Windows 2003, and not on XP, and vice versa.