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java.lang.NoSuchFieldError: level	at org.apache.log4j.spi.RootLogger.setLevel(RootLogger.java:65)	at org.apache.log4j.spi.RootLogger.(RootLogger.java:44)	at org.apache.log4j.LogManager.(LogManager.java:78)	at my.mailet.TestMailet.(TestMailet.java:16)	at java.lang.Class.forName0(Native Method)	at java.lang.Class.forName(Class.java:242)