Program Crash

As a beginner of Unity, I followed the instructions on the official manual (http://docs.unity3d.com/Manual/CreatingAndUsingScripts.html) to add a script to a cube. However, Unity crashed and a message said, Assets/Standard Assets/ParticleSystems/Scripts/WaterHoseParticles.cs(41,48): warning CS0618: UnityEngine.ParticleCollisionEvent.collider' is obsolete: collider property is deprecated. Use colliderComponent instead, which supports Collider and Collider2D components.' By the way, the version I use is 5.3.1(Personal) and my computer system is mac OS X 10.9.5.