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Unity Warning - You are trying to create a MonoBehaviour using the 'new' keyword

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#1

Is there a way to get rid of this warning?

You are trying to create a MonoBehaviour using the 'new' keyword.  This is not allowed.  MonoBehaviours can only be added using AddComponent(). Alternatively, your script can inherit from ScriptableObject or no base class at all
UnityEngine.MonoBehaviour:.ctor () (at ?)
Pathfinding.Drawing.MonoBehaviourGizmos:.ctor () (at ./Library/PackageCache/com.arongranberg.astar@4.3.61/Drawing/MonoBehaviourGizmos.cs:11)
Pathfinding.VersionedMonoBehaviour:.ctor () (at ./Library/PackageCache/com.arongranberg.astar@4.3.61/PackageTools/VersionedMonoBehaviour.cs:27)
Pathfinding.MonoModifier:.ctor () (at ?)
Pathfinding.FunnelModifier:.ctor () (at ./Library/PackageCache/com.arongranberg.astar@4.3.61/Modifiers/FunnelModifier.cs:60)
ProjectSerpens.Pathfinding.AstarPathHelper:FindPath (UnityEngine.Vector3,UnityEngine.Vector3,Pathfinding.ITraversalProvider) (at Assets/Scripts/Pathfinding/AstarPathHelper.cs:73)
ProjectSerpens.Pathfinding.PathRenderer:Update () (at Assets/Scripts/Pathfinding/PathRenderer.cs:60)
#2

I’m going to bet that your AstarPathHelper:FindPath function does something it shouldn’t do. Like trying to run new FunnelModifier().

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#3

You’re absolutely right :smiley:
But what’s the right way? I have a central location where I calculate my path (with modifier, traversalprovider) and then use this path to my my character or draw the path with a LineRenderer

#4

You can have a central Seeker component (with attached modifiers). Then you can either use seeker.StartPath or use AstarPath.StartPath combined with a seeker.PostProcess in the OnPathComplete callback to run the modifiers.

#5

Hi. I am not sure if I fully understand you. This is my approach

I have a AstarPathHelper where I currenlty calculate my path with the wrong new FunnelModifier(), so I made the following modifications

  1. I added a Seeker to my AstarPathHelper GameObject
  2. created a SerializedField for the Seeker and added a reference
  3. Modified my FindPath method
public Path FindPath(Vector3 fromPosition, Vector3 toPosition, ITraversalProvider additionalTraversalProvider)
{
    //var path = ABPath.Construct(fromPosition, toPosition);

    var path = _seeker.StartPath(fromPosition, toPosition);
    
    // BlockManager.TraversalProvider traversalProvider = new (blockManager, BlockManager.BlockMode.OnlySelector, obstacles);
    path.traversalProvider = additionalTraversalProvider;
    AstarPath.StartPath(path);
    path.BlockUntilCalculated();

    // FunnelModifier funnelModifier = new();
    // funnelModifier.Apply(path);

    return path;
}

The result is

Exception: The path has an invalid state. Expected Created found PathQueue
Exception: The path has an invalid state. Expected Created found PathQueue
Exception: The path has an invalid state. Expected Created found Processing
Exception: The path has an invalid state. Expected Created found Processing
Exception: The path has an invalid state. Expected Created found ReturnQueue
Exception: The path has an invalid state. Expected Created found ReturnQueue

at path.BlockUntilCalculated();

#6

Hi

You should only call one of seeker.StartPath and AstarPath.StartPath. Not both.

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