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java.lang.NullPointerException: 	at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:991)	at java.lang.Double.valueOf(Double.java:475)	at pipeapplication.GUI.actionPerformed(GUI.java:194)	at java.awt.Button.processActionEvent(Button.java:392)	at java.awt.Button.processEvent(Button.java:360)	at java.awt.Component.dispatchEventImpl(Component.java:4410)	at java.awt.Component.dispatchEvent(Component.java:4240)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)