java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory

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java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory
at org.apache.jackrabbit.core.query.QueryTreeBuilderRegistry.(QueryTreeBuilderRegistry.java:40)
at com.xpn.xwiki.plugin.query.QueryPlugin.parse(QueryPlugin.java:90)
at com.xpn.xwiki.plugin.query.QueryPlugin.xpath(QueryPlugin.java:100)
at com.xpn.xwiki.plugin.query.QueryPlugin.search(QueryPlugin.java:280)
at com.xpn.xwiki.XWiki.search(XWiki.java:5374)
at com.xpn.xwiki.api.XWiki.search(XWiki.java:2610)

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