Hi everybody,
When I try to open RFGRID by clicking on "grid" on a flow3D FM model on DELFT3D FM Suite, I have this error : 
"An unhandled exception has occurred. Delta Shell needs to be restarted
System.ArgumentNullException: Value cannot be null.
Parameter name: path2
   at System.IO.Path.Combine(String path1, String path2)
   at DeltaShell.Plugins.FMSuite.Common.Gui.RgfGrid.RgfGridEditor.CopyFilesToDirectory(String targetDir, IEnumerable`1 sourcePaths)
   at DeltaShell.Plugins.FMSuite.Common.Gui.RgfGrid.RgfGridEditor.PrepareGridCopies(String[] grids, Boolean[] gridIsEmpty, String tempDir, CoordinateSystemType systemType, ICoordinateSystem coordinateSystem)
   at DeltaShell.Plugins.FMSuite.Common.Gui.RgfGrid.RgfGridEditor.OpenGrids(String[] grids, Boolean[] gridIsEmpty, IEnumerable`1 additionalPaths, IEnumerable`1 polygons, String polFileName, CoordinateSystemType systemType, ICoordinateSystem coordinateSystem)
   at DeltaShell.Plugins.FMSuite.Common.Gui.RgfGrid.RgfGridEditor.OpenGrid(String gridPath, Boolean gridIsEmpty, IEnumerable`1 additionalPaths, ICoordinateSystem coordinateSystem)
   at DeltaShell.Plugins.FMSuite.FlowFM.Gui.NodePresenters.FmModelTreeShortcutNodePresenter.OpenGridEditor(FmModelTreeShortcut shortcut)
   at DeltaShell.Plugins.FMSuite.Common.Gui.NodePresenters.ModelTreeShortcutNodePresenterBase`1.OnNodeDoubleClicked(Object nodeData)
   at DeltaShell.Plugins.ProjectExplorer.ProjectTreeView.TreeViewDoubleClick(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnDoubleClick(EventArgs e)
   at System.Windows.Forms.TreeView.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)"

On wave model, when I open RFGRID everything worked.

Do you know where the error come from ?

Thank for your help.
​​​​​​​Soulayrol Mathieu