Error on Spine: InvalidCastException: Specified cast is not valid.

Hi,
I've updated spine to spine-unity-3.8-2019-08-20, and is throwing all errors internally, making my spines uneditable, since i can access to the skeleton animation script.

Im using Unity 2019.2.2f1 and also exported the spines with 3.8.

Seems to be a problem in the editor mainly.
I get these kind of errors:

InvalidCastException: Specified cast is not valid.
Spine.Unity.Editor.SpineEditorUtilities.IssueWarningsForUnrecommendedTextureSettings (System.String texturePath) (at Assets/Spine/Editor/spine-unity/Editor/Utility/SpineEditorUtilities.cs:172)

NullReferenceException: Object reference not set to an instance of an object
Spine.Unity.Editor.SpineInspectorUtility.PropertyFieldFitLabel (UnityEditor.SerializedProperty property, UnityEngine.GUIContent label, System.Single extraSpace) (at Assets/Spine/Editor/spine-unity/Editor/Utility/SpineInspectorUtility.cs:66)

Mi skeleton animation script looks like the one attached.

Any ideas here?
Already tried all versions of unity, spine, everything. Im going nuts.

Thank you all

 

I was having trouble with the same problem as you, but when I asked a question in the Spine official forum, I came to the solution. Sorry for the Japanese forum. We look forward to helping you.
http://ja.esotericsoftware.com/forum/viewtopic.php?f=13&t=12605&p=56158