Tools' does not contain a definition for .... just after installation

Hello,
I just bought the plugin and I get these errors on Unity Pro 4.3.4f1:

Assets/Custom Pathfinding Support/AstarPathfindingProject/Editor/GraphEditors/GridGeneratorEditor.cs(495,35): error CS0117: Tools' does not contain a definition forcurrent’

Assets/Custom Pathfinding Support/AstarPathfindingProject/Editor/GraphEditors/GridGeneratorEditor.cs(524,42): error CS0117: Tools' does not contain a definition forcurrent’

And all other deffinitions for “Tools”