java.lang.NoClassDefFoundError: org/apache/log4j/Layout

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org/apache/log4j/Layout
java.lang.NoClassDefFoundError: org/apache/log4j/Layout
at org.apache.commons.logging.impl.Log4jFactory.getInstance(Log4jFactory.java:140)
at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:257)
at net.sf.navigator.taglib.UseMenuDisplayerTag.(UseMenuDisplayerTag.java:38)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:140)

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