photonView.isMine isn't set to an instance of an object?

It keeps saying every time my character spawns "NullReferenceExpection: Object reference not set to an instance of an object NetworkCharacter.Update()"

It keeps referencing line 16, which is where the photonVeiw.isMine is located.

What does that mean, and how can I fix it?
public class NetworkCharacter : Photon.MonoBehaviour {

	Vector3 realPosition =;
	Quaternion realRotation = Quaternion.identity;

	// Use this for initialization
	void Start () {
	// Update is called once per frame
	void Update () {
		if( photonView.isMine ) {
			// Do nothing -- the character motor/input/etc... is moving us
		else {
			transform.position = Vector3.Lerp(transform.position, realPosition, 0.1f);
			transform.rotation = Quaternion.Lerp(transform.rotation, realRotation, 0.1f);

	public void OnPhotonSerializeView(PhotonStream stream, PhotonMessageInfo info) {
		if(stream.isWriting) {
			// This is OUR player. We need to send our actual position to the network.

		else {
			// This is someone else's player. We need to receive their position (as of a few
			// millisecond ago, and update our version of that player.

			realPosition = (Vector3)stream.ReceiveNext();
			realRotation = (Quaternion)stream.ReceiveNext();