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java.lang.NullPointerException: sourceCode	at com.gargoylesoftware.htmlunit.WebAssert.notNull(WebAssert.java:471)	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.compile(JavaScriptEngine.java:436)	at com.gargoylesoftware.htmlunit.html.HtmlPage.loadJavaScriptFromUrl(HtmlPage.java:1084)	at com.gargoylesoftware.htmlunit.html.HtmlPage.loadExternalJavaScriptFile(HtmlPage.java:981)	at com.gargoylesoftware.htmlunit.html.HtmlScript.executeScriptIfNeeded(HtmlScript.java:366)	at com.gargoylesoftware.htmlunit.html.HtmlScript$1.execute(HtmlScript.java:228)	at com.gargoylesoftware.htmlunit.html.HtmlScript.onAllChildrenAddedToPage(HtmlScript.java:244)	at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.endElement(HTMLParser.java:607)	at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)	at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.endElement(HTMLParser.java:565)	at org.cyberneko.html.HTMLTagBalancer.callEndElement(HTMLTagBalancer.java:1147)	at org.cyberneko.html.HTMLTagBalancer.endElement(HTMLTagBalancer.java:1049)	at org.cyberneko.html.filters.DefaultFilter.endElement(DefaultFilter.java:206)	at org.cyberneko.html.filters.NamespaceBinder.endElement(NamespaceBinder.java:329)	at org.cyberneko.html.HTMLScanner$ContentScanner.scanEndElement(HTMLScanner.java:3067)	at org.cyberneko.html.HTMLScanner$ContentScanner.scan(HTMLScanner.java:2040)	at org.cyberneko.html.HTMLScanner.scanDocument(HTMLScanner.java:917)	at org.cyberneko.html.HTMLConfiguration.parse(HTMLConfiguration.java:499)	at org.cyberneko.html.HTMLConfiguration.parse(HTMLConfiguration.java:452)	at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)	at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.parse(HTMLParser.java:798)	at com.gargoylesoftware.htmlunit.html.HTMLParser.parse(HTMLParser.java:234)	at com.gargoylesoftware.htmlunit.html.HTMLParser.parseHtml(HTMLParser.java:180)	at com.gargoylesoftware.htmlunit.DefaultPageCreator.createHtmlPage(DefaultPageCreator.java:267)	at com.gargoylesoftware.htmlunit.DefaultPageCreator.createPage(DefaultPageCreator.java:155)	at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseInto(WebClient.java:440)	at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:315)	at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:380)	at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:365)