Data Model definition not found

Error
The report cannot be rendered because of an error, please contact the administrator.
Error Detail
oracle.xdo.servlet.CreateException: Data Model definition not found:/Account Activity in Resource.xdm

Edit the report. The data model name should be in red. Simple click the search option and reselect the data model.

Thanks to Kevin Pinsky

java.rmi.RemoteException: U9KP7Q94: Path not found

"oracle.xdo.XDOException: oracle.xdo.XDOException: java.rmi.RemoteException: U9KP7Q94: Path not found"

Edit the data model and change the path