The project was not built since its build path is incomplete. Cannot find the class file for java.lang.Object.

Here's everything you need to know about initializing Java classes and objects before executing them in the JVM.

Open Open on startup, FATAL ERROR! java.lang.NullPointerException: Cannot invoke "String.equals (Object)" because the return value of "com.limegroup.gnutella.gui.IconButton.getText ()" is null #1037 ...