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java.lang.IllegalArgumentException: adding a window to a container	at java.awt.Container.checkNotAWindow(Container.java:488)	at java.awt.Container.addImpl(Container.java:1089)	at java.awt.Container.add(Container.java:415)	at GUI.PT.ProgressStatsPT.panelWeightMouseClicked(ProgressStatsPT.java:392)	at GUI.PT.ProgressStatsPT.access$600(ProgressStatsPT.java:26)	at GUI.PT.ProgressStatsPT$7.mouseClicked(ProgressStatsPT.java:138)	at java.awt.Component.processMouseEvent(Component.java:6528)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)	at java.awt.Component.processEvent(Component.java:6290)	at java.awt.Container.processEvent(Container.java:2234)	at java.awt.Component.dispatchEventImpl(Component.java:4881)	at java.awt.Container.dispatchEventImpl(Container.java:2292)	at java.awt.Component.dispatchEvent(Component.java:4703)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4898)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4542)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4462)	at java.awt.Container.dispatchEventImpl(Container.java:2278)	at java.awt.Window.dispatchEventImpl(Window.java:2750)	at java.awt.Component.dispatchEvent(Component.java:4703)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)	at java.awt.EventQueue.access$500(EventQueue.java:97)	at java.awt.EventQueue$3.run(EventQueue.java:709)	at java.awt.EventQueue$3.run(EventQueue.java:703)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)	at java.awt.EventQueue$4.run(EventQueue.java:731)	at java.awt.EventQueue$4.run(EventQueue.java:729)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)