Check if you've set a name in Application -> Run. If you didn't, the generated XML is gonna have missing information and then this exception will be thrown.
You have a different solution? A short tip here would help you and many other users who saw this issue last week.
- java.lang.ClassNotFoundException: java.awt.Dimension at java.lang.Class.classForName(Native Method) at java.lang.Class.forName(Class.java:235) at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:2590) at java.io.ObjectInputStream.readNewClassDesc(ObjectInputStream.java:1846)