The fact that people do have incompatible goals and experience scarce resources contradicts this myth about conflict:

I believe the answer is: Conflict always occurs because of misunderstandings.

The main cause of conflicts that happen in the world is the difference in interest between groups or individuals regardless of the relationship between them.
For example, two friends could involve in a conflict if they both aiming to get one spot for job opportunities even though they are extremely close before.

The answer would be hard press.