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

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java.lang.NoClassDefFoundError: org/apache/log4j/LogManager
at marytts.util.MaryUtils.isLog4jConfigured(MaryUtils.java:828)
at marytts.server.Mary.configureLogging(Mary.java:310)
at marytts.server.Mary.startup(Mary.java:227)
at marytts.server.Mary.startup(Mary.java:205)
at marytts.util.MaryRuntimeUtils.ensureMaryStarted(MaryRuntimeUtils.java:71)
at marytts.LocalMaryInterface.(LocalMaryInterface.java:63)
at org.openhab.voice.marytts.internal.MaryTTSService.getMaryInterface(MaryTTSService.java:203)

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