I am getting error in install terrain tool

Retrieving array element that was out of bounds
UnityEditor.TerrainTools.FilterStackView:ElementHeightCB (int)
UnityEditorInternal.ReorderableList:CacheIfNeeded ()
UnityEditorInternal.ReorderableList:GetListElementHeight ()
UnityEditorInternal.ReorderableList:smile:oLayoutList ()
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

Looks similar to this, appears to be an active bug. Found your post when I was researching so figured I’d drop this in.

https://issuetracker.unity3d.com/issues/inspector-window-broken-with-retrieving-array-element-that-was-out-of-bounds-after-choose-paint-terrain

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I’m having the same issue. Thank you for posting about it. The error is keeping the terrain tools from working properly. Right now, I can’t even edit the terrain anymore.