I have problem, i cant spawn enemies with script Waypoints.

Because you are only creating the Transform[1] array but you are not adding new transforms to it.

My advice is:

Since you are only using position you can create a Vector3 array instead of a transform array.

But if you need transform array you should find the related object from the scene(or spawn them) and assign their Transform to your array.

Havent tested the below code but i simply changed Trannsform array to Vector3 array and changed its referances in code.It should work or at least put you in the correct path :)

     public Vector3[] waypoints = new Vector3[1];
     public float waypointRadius = 1.5f;
     public float damping = 0.1f;
     public bool loop = false;
     public float speed = 2.0f;
     public bool faceHeading = true;
      
     private Vector3 currentHeading,targetHeading;
     private int targetwaypoint;
     private Transform xform;
     private bool useRigidbody;
     private Rigidbody rigidmember;
      
     void OnTriggerEnter(Collider collision)
     {
     Destroy(gameObject);
     }
      
      
     // Use this for initialization
     protected void Start ()
     {
      
      
     xform = transform;
     currentHeading = xform.forward;
     if(waypoints.Length<=0)
     {
     Debug.Log("No waypoints on "+name);
     enabled = false;
     }
     targetwaypoint = 0;
     if(rigidbody!=null)
     {
     useRigidbody = true;
     rigidmember = rigidbody;
     }
     else
     {
     useRigidbody = false;
     }
     }
      
      
     // calculates a new heading
     protected void FixedUpdate ()
     {
     targetHeading = waypoints[targetwaypoint] - xform.position;
      
     currentHeading = Vector3.Lerp(currentHeading,targetHeading,damping*Time.deltaTime);
     }
      
     // moves us along current heading
     protected void Update()
     {
      
      
     if(useRigidbody)
     rigidmember.velocity = currentHeading * speed;
     else
     xform.position +=currentHeading * Time.deltaTime * speed;
     if(faceHeading)
     xform.LookAt(xform.position+currentHeading);
      
     if(Vector3.Distance(xform.position,waypoints[targetwaypoint])<=waypointRadius)
     {
     targetwaypoint++;
     if(targetwaypoint>=waypoints.Length)
     {
     targetwaypoint = 0;
     if(!loop)
     enabled = false;
     }
     }
     }
      
      
     // draws red line from waypoint to waypoint
     public void OnDrawGizmos()
     {
     Gizmos.color = Color.red;
     if(waypoints==null)
     return;
     for(int i=0;i< waypoints.Length;i++)
     {
     Vector3 pos = waypoints[i];
     if(i>0)
     {
     Vector3 prev = waypoints[i-1];
     Gizmos.DrawLine(prev,pos);
     }
     }
     }