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

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java.lang.NullPointerException:
at net.sourceforge.htmlunit.cyberneko.HTMLElements.defineParents(HTMLElements.java:533)
at net.sourceforge.htmlunit.cyberneko.HTMLElements.(HTMLElements.java:520)
at net.sourceforge.htmlunit.cyberneko.HTMLConfiguration.(HTMLConfiguration.java:221)
at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.createConfiguration(HTMLParser.java:467)
at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.(HTMLParser.java:424)
at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.(HTMLParser.java:377)
at com.gargoylesoftware.htmlunit.html.HTMLParser.parse(HTMLParser.java:212)
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)

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