Crash when selecting the A* object

When I select the A* object in my scene, I get an exception with the following message:

System.ArrayTypeMismatchException: Source array type cannot be assigned to destination array type.
at Pathfinding.Serialization.AstarSerializer.DeserializeEditorSettings (Pathfinding.GraphEditorBase[] graphEditors) [0x0008b] in /Users/Assets/3rd Party/AstarPathfindingProject/Core/Serialization/JsonSerializer.cs:728

at AstarPathEditor+c__AnonStorey2.<>m__2 (Boolean force) [0x00049] in /Users/Assets/3rd Party/AstarPathfindingProject/Editor/AstarPathEditor.cs:2282

at AstarPath.ProcessWorkItems (Boolean force) [0x0005e] in /Users/Assets/3rd Party/AstarPathfindingProject/Core/AstarPath.cs:800

What can I look at?