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

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java.lang.NoClassDefFoundError: org/apache/log4j/Level
at org.compiere.util.CLogMgtLog4J.(CLogMgtLog4J.java:45)
at org.compiere.util.CLogMgt.initialize(CLogMgt.java:156)
at org.compiere.Compiere.startup(Compiere.java:401)
at org.compiere.Compiere.main(Compiere.java:518)

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