Why have I received a "SORRY, WE CAN'T DISPLAY THIS INSIGHT" message?

When creating an insight in Universal Analytics, you might receive the following message: "SORRY, WE CAN'T DISPLAY THIS INSIGHT".

This message appears when you drag measures or attributes into an insight that do not logically relate to each other, in accordance with the data model. If your selected measures or attributes do not logically relate, Universal Analytics is unable to show them on the insight.