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java.lang.NullPointerException: 	at sun.net.www.http.KeepAliveStream.close(KeepAliveStream.java:63)	at java.io.FilterInputStream.close(FilterInputStream.java:159)	at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.close(HttpURLConnection.java:1283)	at java.io.FilterInputStream.close(FilterInputStream.java:159)	at javax.swing.JEditorPane.read(JEditorPane.java:514)	at javax.swing.JEditorPane$PageLoader.run(JEditorPane.java:551)