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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:373)	at com.gargoylesoftware.htmlunit.html.HtmlPage.loadJavaScriptFromUrl(HtmlPage.java:1083)	at com.gargoylesoftware.htmlunit.html.HtmlPage.loadExternalJavaScriptFile(HtmlPage.java:974)	at com.gargoylesoftware.htmlunit.html.HtmlScript.executeScriptIfNeeded(HtmlScript.java:359)	at com.gargoylesoftware.htmlunit.html.HtmlScript$1.execute(HtmlScript.java:223)	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.processPostponedActions(JavaScriptEngine.java:560)	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.access$1(JavaScriptEngine.java:554)	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:529)	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:432)	at com.gargoylesoftware.htmlunit.html.HtmlPage.loadExternalJavaScriptFile(HtmlPage.java:976)	at com.gargoylesoftware.htmlunit.html.HtmlScript.executeScriptIfNeeded(HtmlScript.java:359)	at com.gargoylesoftware.htmlunit.html.HtmlScript$1.execute(HtmlScript.java:223)	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.processPostponedActions(JavaScriptEngine.java:560)	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:493)	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$6.doRun(JavaScriptEngine.java:457)	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:528)	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.callFunction(JavaScriptEngine.java:464)	at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptFunctionIfPossible(HtmlPage.java:932)	at com.gargoylesoftware.htmlunit.javascript.background.JavaScriptFunctionJob.runJavaScript(JavaScriptFunctionJob.java:53)	at com.gargoylesoftware.htmlunit.javascript.background.JavaScriptExecutionJob.run(JavaScriptExecutionJob.java:76)	at com.gargoylesoftware.htmlunit.javascript.background.JavaScriptJobManagerImpl$ExecutingJobTracker.run(JavaScriptJobManagerImpl.java:90)	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)	at java.util.concurrent.FutureTask.run(Unknown Source)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(Unknown Source)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)