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    java.lang.NullPointerException
        at com.xpn.xwiki.XWiki.getServletPath(XWiki.java:4368)
        at com.xpn.xwiki.web.XWikiServletURLFactory.addServletPath(XWikiServletURLFactory.java:208)
        at com.xpn.xwiki.web.XWikiServletURLFactory.createURL(XWikiServletURLFactory.java:178)
        at com.xpn.xwiki.web.XWikiServletURLFactory.createExternalURL(XWikiServletURLFactory.java:273)
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