logback配置问题 配置报错 

想要按日期和序号来备份日志文件，如下配置

<appender name="FILEINFO" class="ch.qos.logback.core.rolling.RollingFileAppender">
		<file>${LOG_HOME}/04020301_010.log</file>
		<rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy">
			<fileNamePattern>${LOG_HOME}/04020301_010_%d{yyyyMMdd}_%i.zip</fileNamePattern>
			<minIndex>1</minIndex>
			<maxIndex>2</maxIndex>
		</rollingPolicy>
		<triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
			<maxFileSize>1MB</maxFileSize>
		</triggeringPolicy>
		<encoder>
			<pattern>[%date] [%thread] [%level] [%c] %msg%n</pattern>
		</encoder>
	</appender>

发现是把i的值也当作日期的Pattern了，这种问题需要怎么解决？