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Object reference error question

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I'm still new to C, and am probably missing something basic. I have this script that keeps giving me this error: NullReferenceException: Object reference not set to an instance of an object ParticleCollide.OnParticleCollision (UnityEngine.GameObject other) (at Assets/Scripts/ParticleCollide.cs:35) It compiles, and lets me run it, but everytime a collision occurs, I get the error above. I Bolded line 35 that's throwing the error. using UnityEngine; using System.Collections; public class ParticleCollide : MonoBehaviour { public ParticleSystem ps; GameObject GC; void Start () { GC = GameObject.Find ("GrabberCube"); ps = GetComponent(); } void OnParticleCollision(GameObject other){ ParticleSystem.Particle[] particles = new ParticleSystem.Particle[ps.particleCount]; int num = ps.GetParticles (particles); //Debug.Log("found "+num+"of particles"); for (int i=0; i

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