I'm having a 'FileNamePattern [] does not contain a valid DateToken' exception on run time. This happens only on Windows 7 x64 running on a JVM x86 or x64. My configuration file: <?xml version="1.0" encoding="UTF-8"?> <configuration> <appender name="APP" class="ch.qos.logback.core.rolling.RollingFileAppender"> <File>${APP_HOME}\logs\app\app.log</File> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <FileNamePattern>${APP_HOME}\logs\app\app.%d.gz</FileNamePattern> <MaxHistory>30</MaxHistory> </rollingPolicy> <layout class="ch.qos.logback.classic.PatternLayout"> <Pattern>%-5level %date{dd/MM/yy HH:mm:ss} [%thread] %logger{20} - %X{state} - %X{identity}%n%msg%n%n</Pattern> </layout> </appender> <logger name="net.app" additivity="false" level="debug"> <appender-ref ref="APP"/> </logger> <root level="info"> <appender-ref ref="APP"/> </root> </configuration> Stdout information: 09:54:48,807 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.rolling.RollingFileAppender] 09:54:48,807 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [APP] 09:54:48,901 |-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Pushing component [rollingPolicy] on top of the object stack. 09:54:48,901 |-INFO in c.q.l.core.rolling.TimeBasedRollingPolicy - Adding parent to RollingPolicy: APP 09:54:48,948 |-INFO in c.q.l.core.rolling.TimeBasedRollingPolicy - Will use gz compression 09:54:48,948 |-ERROR in ch.qos.logback.core.joran.spi.Interpreter@11:22 - RuntimeException in Action for tag [rollingPolicy] java.lang.IllegalStateException: FileNamePattern [C:\Program Files (x86)\app\logs\app\app.%d.gz] does not contain a valid DateToken at java.lang.IllegalStateException: FileNamePattern [C:\Program Files (x86)\app\logs\app\app.%d.gz] does not contain a valid DateToken at at ch.qos.logback.core.rolling.TimeBasedRollingPolicy.start(TimeBasedRollingPolicy.java:87) at at ch.qos.logback.core.joran.action.NestedComplexPropertyIA.end(NestedComplexPropertyIA.java:159) at at ch.qos.logback.core.joran.spi.Interpreter.callEndAction(Interpreter.java:307) at at ch.qos.logback.core.joran.spi.Interpreter.endElement(Interpreter.java:187) at at ch.qos.logback.core.joran.spi.Interpreter.endElement(Interpreter.java:174) at at ch.qos.logback.core.joran.spi.EventPlayer.play(EventPlayer.java:48) at at ch.qos.logback.core.joran.spi.Interpreter.play(Interpreter.java:324) at at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:109) at at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:76) at at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:40) at at ch.qos.logback.classic.util.ContextInitializer.configureByResource(ContextInitializer.java:47) at at ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:108) at at org.slf4j.impl.StaticLoggerBinder.init(StaticLoggerBinder.java:85) at at org.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:56) at at org.slf4j.LoggerFactory.getSingleton(LoggerFactory.java:189) at at org.slf4j.LoggerFactory.bind(LoggerFactory.java:112) at at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:105) at at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:235) at at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:208) at at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:221) at at br.com.ibnetwork.xingu.container.impl.ContainerSupport.<init>(ContainerSupport.java:23) at at br.com.ibnetwork.xingu.container.impl.Pulga.<init>(Pulga.java:39) at at br.com.ibnetwork.xingu.container.ContainerUtils.createContainer(ContainerUtils.java:70) at at br.com.ibnetwork.xingu.container.ContainerUtils.getContainer(ContainerUtils.java:62) at at app.daemon.DaemonRunner.configure(DaemonRunner.java:42) at at app.daemon.DaemonRunner.main(DaemonRunner.java:61) at at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at at java.lang.reflect.Method.invoke(Unknown Source) at at app.Launcher.launch(Launcher.java:42) at at app.Launcher.main(Launcher.java:26) 09:54:48,948 |-ERROR in ch.qos.logback.core.joran.spi.Interpreter@13:59 - no applicable action for [layout], current pattern is[[configuration][appender][layout]] 09:54:48,948 |-ERROR in ch.qos.logback.core.joran.spi.Interpreter@14:18 - no applicable action for [Pattern], current pattern is [[configuration][appender][layout][Pattern]]