Here's the error it's giving me now.
NullReferenceException: Object reference not set to an instance of an object
SuperTextMeshEditor.OnInspectorGUI () (at Assets/Clavian/SuperTextMesh/Scripts/SuperTextMesh.cs:192)
UnityEditor.InspectorWindow.DrawEditor (UnityEditor.Editor editor, Int32 editorIndex, Boolean rebuildOptimizedGUIBlock, System.Boolean& showImportedObjectBarNext, UnityEngine.Rect& importedObjectBarRect) (at C:/buildslave/unity/build/Editor/Mono/Inspector/InspectorWindow.cs:1235)
I'm using Unity 5.4.1f1. I just deleted and reimported the asset again but same thing error pops up. Don't know if this means anything but the documentation resource still says 1.3 while the asset store says 1.4.