If you were able to run successfully in the morning but are no longer able to do so, it is likely that you lost connection to your data. Click on your Input Data Source node and set the Rerun property to Yes. Then rerun the node and make sure that it runs successfully.
If the Input Data Source node runs successfully, right-click on the Interactive Grouping node and click Run. If the node fails, right click on the node and choose Results... From the Results browser, click on View --> SAS Results --> Log and search the resulting log file for Error: (be sure to include the colon). It should give you some more information regarding why the node failed.
Let me know what you find out.
Cordially,
Doug