java.lang.NoSuchFieldError: level

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

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