java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.gargoylesoftware.htmlunit.javascript.SimpleScriptable.getPrototype(SimpleScriptable.java:247)
at com.gargoylesoftware.htmlunit.javascript.SimpleScriptable.makeScriptableFor(SimpleScriptable.java:217)
at com.gargoylesoftware.htmlunit.html.DomNode.getScriptObject(DomNode.java:790)
at com.gargoylesoftware.htmlunit.html.HtmlScript.setAndExecuteReadyState(HtmlScript.java:457)
at com.gargoylesoftware.htmlunit.html.HtmlScript$1.execute(HtmlScript.java:212)
at com.gargoylesoftware.htmlunit.html.HtmlScript.onAllChildrenAddedToPage(HtmlScript.java:238)
at org.cyberneko.html.HTMLTagBalancer.callEndElement(HTMLTagBalancer.java:1170)
at org.cyberneko.html.HTMLTagBalancer.endElement(HTMLTagBalancer.java:1072)
at org.cyberneko.html.filters.DefaultFilter.endElement(DefaultFilter.java:206)
at org.cyberneko.html.filters.NamespaceBinder.endElement(NamespaceBinder.java:330)
at org.cyberneko.html.HTMLScanner$ContentScanner.scanEndElement(HTMLScanner.java:3116)
at org.cyberneko.html.HTMLScanner$ContentScanner.scan(HTMLScanner.java:2083)
at org.cyberneko.html.HTMLScanner.scanDocument(HTMLScanner.java:918)
at org.cyberneko.html.HTMLConfiguration.parse(HTMLConfiguration.java:499)
at org.cyberneko.html.HTMLConfiguration.parse(HTMLConfiguration.java:452)
at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.parse(HTMLParser.java:901)
at com.gargoylesoftware.htmlunit.html.HTMLParser.parse(HTMLParser.java:350)
at com.gargoylesoftware.htmlunit.html.HTMLParser.parseHtml(HTMLParser.java:304)
at com.gargoylesoftware.htmlunit.DefaultPageCreator.createHtmlPage(DefaultPageCreator.java:134)
at com.gargoylesoftware.htmlunit.DefaultPageCreator.createPage(DefaultPageCreator.java:101)
at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseInto(WebClient.java:449)
at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:332)
at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:389)
at undefined.myClient.main(myClient.java:8)

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