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java.lang.NullPointerException: 	at net.sourceforge.htmlunit.corejs.javascript.Delegator.getPrototype(Delegator.java:173)	at net.sourceforge.htmlunit.corejs.javascript.ScriptableObject.getProperty(ScriptableObject.java:1619)	at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.getPropFunctionAndThisHelper(ScriptRuntime.java:2227)	at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.getPropFunctionAndThis(ScriptRuntime.java:2214)	at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:3143)	at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpret(Interpreter.java:2487)	at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:164)	at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.doTopCall(ContextFactory.java:398)	at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.doTopCall(HtmlUnitContextFactory.java:252)	at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3065)	at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.exec(InterpretedFunction.java:175)	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$3.doRun(JavaScriptEngine.java:794)	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:906)	at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:515)	at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:507)	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:803)	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:779)	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:767)	at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptIfPossible(HtmlPage.java:904)	at com.gargoylesoftware.htmlunit.html.HtmlScript.executeInlineScriptIfNeeded(HtmlScript.java:307)	at com.gargoylesoftware.htmlunit.html.HtmlScript.executeScriptIfNeeded(HtmlScript.java:368)	at com.gargoylesoftware.htmlunit.html.HtmlScript$2.execute(HtmlScript.java:238)	at com.gargoylesoftware.htmlunit.html.HtmlScript.onAllChildrenAddedToPage(HtmlScript.java:257)	at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.endElement(HTMLParser.java:772)	at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)	at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.endElement(HTMLParser.java:729)	at net.sourceforge.htmlunit.cyberneko.HTMLTagBalancer.callEndElement(HTMLTagBalancer.java:1209)	at net.sourceforge.htmlunit.cyberneko.HTMLTagBalancer.endElement(HTMLTagBalancer.java:1111)	at net.sourceforge.htmlunit.cyberneko.filters.DefaultFilter.endElement(DefaultFilter.java:207)	at net.sourceforge.htmlunit.cyberneko.filters.NamespaceBinder.endElement(NamespaceBinder.java:337)	at net.sourceforge.htmlunit.cyberneko.HTMLScanner$ContentScanner.scanEndElement(HTMLScanner.java:3137)	at net.sourceforge.htmlunit.cyberneko.HTMLScanner$ContentScanner.scan(HTMLScanner.java:2100)	at net.sourceforge.htmlunit.cyberneko.HTMLScanner.scanDocument(HTMLScanner.java:927)	at net.sourceforge.htmlunit.cyberneko.HTMLConfiguration.parse(HTMLConfiguration.java:506)	at net.sourceforge.htmlunit.cyberneko.HTMLConfiguration.parse(HTMLConfiguration.java:459)	at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)	at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.parse(HTMLParser.java:979)	at com.gargoylesoftware.htmlunit.html.HTMLParser.parse(HTMLParser.java:241)	at com.gargoylesoftware.htmlunit.html.HTMLParser.parseHtml(HTMLParser.java:187)	at com.gargoylesoftware.htmlunit.DefaultPageCreator.createHtmlPage(DefaultPageCreator.java:269)	at com.gargoylesoftware.htmlunit.DefaultPageCreator.createPage(DefaultPageCreator.java:157)	at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseInto(WebClient.java:512)	at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:386)	at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:304)	at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:451)	at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:436)	at nairaland.UnitTest$1.run(UnitTest.java:28)