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

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java.lang.NoClassDefFoundError: org/apache/log4j/LogManager
at marytts.util.MaryUtils.isLog4jConfigured(
at marytts.server.Mary.configureLogging(
at marytts.server.Mary.startup(
at marytts.server.Mary.startup(
at marytts.util.MaryRuntimeUtils.ensureMaryStarted(
at marytts.LocalMaryInterface.(
at org.openhab.voice.marytts.internal.MaryTTSService.getMaryInterface(

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