ML-Agent tutorial says "Heuristic method called but not implemented.Returning placeholder actions." and fails to proceed

using System.Collections.General;
using UnityEngine;
using Unity.MLAgents;
using Unity.MLAgents.Sensors;
using Unity.MLAgents.Actuators;

public class RollerAgent:Agent
{
    RigidbodyrBody;
    void Start() {
        rBody = GetComponent <Rigidbody >();
    }

    public Transform Target;
    public override void OnEpisodeBegin()
    {
       // If the Agent fell, zeroits moment
        if (this.transform.localPosition.y<0)
        {
            This.rBody.angularVelocity=Vector3.zero;
            this.rBody.velocity=Vector3.zero;
            this.transform.localPosition=new Vector3(0,0.5f,0);
        }

        // Move the target to a new spot
        Target.localPosition = new Vector3 (Random.value*8-4,
                                           0.5f,
                                           Random.value*8-4);
    }

    public override void CollectObserutions (VectorSensor sensor)
    {
    // Target and Agent positions
    sensor.AddObserveration(Target.localPosition);
    sensor.AddObserveration(this.transform.localPosition);

    // Agent velocity
    sensor.AddObserveration(rBody.velocity.x);
    sensor.AddObserveration(rBody.velocity.z);
    }
    

    public float forceMultiplier=10;
    public override void OnActionReceived (ActionBuffers actionBuffers)
    {
        // Actions, size = 2
        Vector3 controlSignal=Vector3.zero;
        controlSignal.x = actionBuffers.ContinuousActions[0];
        controlSignal.z=actionBuffers.ContinuousActions[1];
        rBody.AddForce(controlSignal*forceMultiplier);

        // Rewards
        float distanceToTarget=Vector3.Distance(this.transform.localPosition, Target.localPosition);

        // Reached target
        if (distanceToTarget<1.42f)
        {
            SetReward (1.0f);
            EndEpisode();
        }

        // Fell off platform
        else if (this.transform.localPosition.y<0)
        {
            EndEpisode();
        }
    }

    public override void Heuristic (in ActionBuffers actionsOut)
    {
        var continuousActionsOut=actionsOut.ContinuousActions;
        continuousActionsOut[0] = Input.GetAxis("Horizontal");
        continuousActionsOut[1] = Input.GetAxis("Vertical");
    }

}