CiscoWorks has problem to recognize the latest version of MDF, and MDF 1.7 it's a requeriment of most this packages Cat1900, LibInventory, Rtr800, SharedInventoryCatIOS, SharedSwim2900XL, SharedSwimCat1900, SharedSwimIOS.
check that MDF 1.7 is currently installed.
Common Services > Software Center > Device update, click on Common Services