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Build Identifier: 20110615-0604 NullPointer exception caused by not having components inside a CardLayout. Should be obvious from the stack trace in the attached file. Reproducible: Didn't try Steps to Reproduce: 1.Create a JFrame 2.Put a JSplitPane in contentPane 3.Put a JPanel in right side of the JSplitPane 4.Set the layout to CardLayout 5.Try to add JScrollablePane
Created attachment 209874 [details] StackTrace and sample file
Works for me with version from trunk.
Also works fine for me. According to your log, you are using an old version of WB, so please update to the latest build and try it again... http://eclipse.org/windowbuilder/download.php