If problems occur with rooms in a model, Revit provides explanations in dialogs, room tags, or room schedules.
When an error occurs, you can select the tag or the schedule row that displays the error, and click Modify | Room Tags tabWarning panel
Show Related Warnings or click Modify Schedule/Quantities tab
Error panel
Explain Error.
Revit shows the message that it displayed when the problem first occurred. You can use standard error dialog features (like Show) to find the relevant tags.