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java.lang.NullPointerException at swarmCanvas.paint(Swarm.java:192) at sun.awt.RepaintArea.paint(RepaintArea.java:298) at sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:196) at java.awt.Component.dispatchEventImpl(Component.java:2663) at java.awt.Component.dispatchEvent(Component.java:2497) at java.awt.EventQueue.dispatchEvent(EventQueue.java:339) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:131) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:98) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)