Hi Debora,

Sounds like something's (RS URL?) missing in the Sharepoint RS config on the Central Admin Server - although I really am guessing in the dark now 🙂

There's some setup steps here - hopefully they'll be of use.

http://blogs.msdn.com/b/ritazh/archive/2012/01/23/install-and-configure-reporting-services-for-sharepoint-2010-integration.aspx

Thanks

Gaz