I get: 'UnassignedReferenceException' when trying to play a sound clip though a sound source, yet i am assigning it. HELP?!

         //Detects collision with player projectile
         if (_enemyHit.gameObject.tag == "PlayerProjectile" && isActiveAndEnabled)
         {
             m_crewVoiceSource.clip = m_destroyedClip;
             m_crewVoiceSource.Play();
 
             m_enemyObjectPool.RecycleObjectInPool(_enemyHit.gameObject);
             m_enemyObjectPool.RecycleObjectInPool(gameObject);
             m_playerController.AddScore(m_score);
             m_playerController.AddKillScore();
         }

The source is assigned in the inspector and is a gameobject. Yet I'm being told its unassigned.

Any ideas?

Thanks