Softbody Surface blueprint seems to fail at generation

[Snail921]

Hi,
When I try to generate and edit a softbody surface blueprint by following the procedure explained here, obi seems to fail to generate valid data for the softbody surface blueprint.
I feed my mesh to a newly created blueprint and  hit generate. Right after the generation, nothing happens but when I hit edit button, I get an error as bellow.

NullReferenceException: Object reference not set to an instance of an object
Obi.ObiActorBlueprintEditor.OnSceneGUI (UnityEditor.SceneView sceneView) (at Assets/Obi/Editor/Common/Blueprints/ObiActorBlueprintEditor.cs:314)
UnityEditor.SceneView.CallOnSceneGUI () (at <1798d6bccd2b44b2854be2fbcc2463b3>:0)
UnityEditor.SceneView.HandleSelectionAndOnSceneGUI () (at <1798d6bccd2b44b2854be2fbcc2463b3>:0)
UnityEditor.SceneView.OnGUI () (at <1798d6bccd2b44b2854be2fbcc2463b3>:0)
UnityEditor.HostView.InvokeOnGUI (UnityEngine.Rect onGUIPosition, UnityEngine.Rect viewRect) (at <1798d6bccd2b44b2854be2fbcc2463b3>:0)
UnityEditor.DockArea.DrawView (UnityEngine.Rect viewRect, UnityEngine.Rect dockAreaRect) (at <1798d6bccd2b44b2854be2fbcc2463b3>:0)
UnityEditor.DockArea.OldOnGUI () (at <1798d6bccd2b44b2854be2fbcc2463b3>:0)
UnityEngine.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 parentTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout, UnityEngine.Rect layoutSize, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <6aef74cd6e9c4a708ea4a51c97de39d4>:0)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <6aef74cd6e9c4a708ea4a51c97de39d4>:0)
UnityEngine.UIElements.IMGUIContainer.DoIMGUIRepaint () (at <6aef74cd6e9c4a708ea4a51c97de39d4>:0)
UnityEngine.UIElements.UIR.RenderChainCommand.ExecuteNonDrawMesh (UnityEngine.UIElements.UIR.DrawParams drawParams, System.Single pixelsPerPoint, System.Exception& immediateException) (at <6aef74cd6e9c4a708ea4a51c97de39d4>:0)
Rethrow as ImmediateModeException
UnityEngine.UIElements.UIR.RenderChain.Render () (at <6aef74cd6e9c4a708ea4a51c97de39d4>:0)
UnityEngine.UIElements.UIRRepaintUpdater.Update () (at <6aef74cd6e9c4a708ea4a51c97de39d4>:0)
UnityEngine.UIElements.VisualTreeUpdater.UpdateVisualTreePhase (UnityEngine.UIElements.VisualTreeUpdatePhase phase) (at <6aef74cd6e9c4a708ea4a51c97de39d4>:0)
UnityEngine.UIElements.Panel.UpdateForRepaint () (at <6aef74cd6e9c4a708ea4a51c97de39d4>:0)
UnityEngine.UIElements.Panel.Repaint (UnityEngine.Event e) (at <6aef74cd6e9c4a708ea4a51c97de39d4>:0)
UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at <6aef74cd6e9c4a708ea4a51c97de39d4>:0)
UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& eventHandled) (at <6aef74cd6e9c4a708ea4a51c97de39d4>:0)
UnityEngine.UIElements.UIEventRegistration.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at <6aef74cd6e9c4a708ea4a51c97de39d4>:0)
UnityEngine.UIElements.UIEventRegistration+<>c.<.cctor>b__1_2 (System.Int32 i, System.IntPtr ptr) (at <6aef74cd6e9c4a708ea4a51c97de39d4>:0)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr, System.Boolean& result) (at <9ff04fda545c4aacb8dab659ad40b2f4>:0)
UnityEditor.SceneManagement.EditorSceneManager:NewScene(NewSceneSetup)
Obi.ObiActorBlueprintEditor:EnterBlueprintEditMode() (at Assets/Obi/Editor/Common/Blueprints/ObiActorBlueprintEditor.cs:213)
UnityEditor.EditorApplication:Internal_CallDelayFunctions()

The mesh is a relatively simple mesh with 1138verts. which has been created for this experimental purpose and ported from blender.

The mesh's Read/Write setting has been checked on when it was imported to Unity.
Do you have any idea what is causing this issue?