Polybrush Error: Look Rotation viewing vector is zero - Polybrush doesn't paint objects

Hello,
I recently downloaded Polybrush and wanted to use the "Paint Prefabs" option on a model to paint grass models from this asset store pack: https://assetstore.unity.com/packages/3d/vegetation/low-poly-nature-free-vegetation-134006
The problem is, that when I try to paint, no new models appear and the console says:

"Look rotation viewing vector is zero
UnityEngine.Quaternion:LookRotation(Vector3, Vector3)
Polybrush.z_BrushModePrefab:RandomRay(Vector3, Vector3, Single, Single, AnimationCurve) (at Assets/ProCore/Polybrush/Code/Editor/Brush Modes/z_BrushModePrefab.cs:294)
Polybrush.z_BrushModePrefablaceGameObject(z_RaycastHit, GameObject, z_BrushTarget, z_BrushSettings) (at Assets/ProCore/Polybrush/Code/Editor/Brush Modes/z_BrushModePrefab.cs:235)
Polybrush.z_BrushModePrefab:OnBrushApply(z_BrushTarget, z_BrushSettings) (at Assets/ProCore/Polybrush/Code/Editor/Brush Modes/z_BrushModePrefab.cs:222)
Polybrush.z_Editor:ApplyBrush() (at Assets/ProCore/Polybrush/Code/Editor/Interface/z_Editor.cs:858)
Polybrush.z_Editor:OnSceneGUI(SceneView) (at Assets/ProCore/Polybrush/Code/Editor/Interface/z_Editor.cs:603)
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)"


I would be grateful for the help.

 

If you're on 2018.3, you should know Polybrush isn't working very well, specially the painting part. According to the devs, they're working on releasing the new version 1.x (out of Beta I presume) in one or two weeks. See: https://forum.unity.com/threads/advice-for-a-simple-terrain-on-mobile.617842/

 

Ok, thanks.