java.lang.NoClassDefFoundError: org/apache/log4j/Leve l

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java.lang.NoClassDefFoundError: org/apache/log4j/Leve l
at org.compiere.util.CLogMgtLog4J.(CLogMgtLog4J.java:42)
at org.compiere.util.CLogMgt.initialize(CLogMgt.java:120)
at org.compiere.Compiere.startup(Compiere.java:397)
at org.compiere.Compiere.main(Compiere.java:491)

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