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Must insert new content into body element-
java.lang.RuntimeException: Must insert new content into body element-	at javax.swing.text.html.HTMLDocument$HTMLReader.generateEndsSpecsForMidInsert(HTMLDocument.java:1878)	at javax.swing.text.html.HTMLDocument$HTMLReader.(HTMLDocument.java:1854)	at javax.swing.text.html.HTMLDocument$HTMLReader.(HTMLDocument.java:1729)	at javax.swing.text.html.HTMLDocument$HTMLReader.(HTMLDocument.java:1724)	at javax.swing.text.html.HTMLDocument.getReader(HTMLDocument.java:125)	at javax.swing.text.html.HTMLEditorKit.read(HTMLEditorKit.java:228)	at javax.swing.JEditorPane.read(JEditorPane.java:504)	at javax.swing.JEditorPane.read(JEditorPane.java:478)	at com.UrlChecker.panels.HTML.EditorPane._$34246(EditorPane.java:105)	at com.UrlChecker.panels.HTML.EditorPane.changeUrls(EditorPane.java:142)	at com.UrlChecker.demo.UrlChecker.changeHtml(UrlChecker.java:131)	at com.UrlChecker.panels.Report.URLTabView.mouseClicked(URLTabView.java:91)	at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:208)	at java.awt.Component.processMouseEvent(Component.java:5096)	at java.awt.Component.processEvent(Component.java:4890)	at java.awt.Container.processEvent(Container.java:1566)	at java.awt.Component.dispatchEventImpl(Component.java:3598)	at java.awt.Container.dispatchEventImpl(Container.java:1623)	at java.awt.Component.dispatchEvent(Component.java:3439)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3450)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3174)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3095)	at java.awt.Container.dispatchEventImpl(Container.java:1609)	at java.awt.Window.dispatchEventImpl(Window.java:1585)	at java.awt.Component.dispatchEvent(Component.java:3439)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)