How to say, "It doesn't make sense" in Spanish (Día 14)

The video tutorial discusses the song 'MENA Mora' by Juanes, focusing on a specific line that translates to 'Without you, my life doesn't make sense.' The lesson introduces the phrase 'No tiene sentido' as the phrase of the day, providing various examples of its usage in different contexts.

Provide an example of a situation where you might say 'It doesn't make sense'.

What is the significance of the phrase 'Cinti mi vida no tiene sentido' in the context of the song?