title: I am facing a problem with spring boot logback
body: <p>Logging system failed to initialize using configuration from 'classpath:logback-spring.xml'java.lang.IllegalStateException: Logback configuration error detected: ERROR in ch.qos.logback.core.pattern.parser.Compiler@3f102e87 - There is no conversion class registered for conversion word [vtep1024]ERROR in ch.qos.logback.core.pattern.parser.Compiler@3f102e87 - [vtep1024] is not a valid conversion wordERROR in ch.qos.logback.core.pattern.parser.Compiler@27abe2cd - There is no conversion class registered for conversion word [vtep1024]ERROR in ch.qos.logback.core.pattern.parser.Compiler@27abe2cd - [vtep1024] is not a valid conversion word    at org.springframework.boot.logging.logback.LogbackLoggingSystem.loadConfiguration(LogbackLoggingSystem.java:166)   at org.springframework.boot.logging.AbstractLoggingSystem.initializeWithSpecificConfig(AbstractLoggingSystem.java:67)</p>
  
  <hr>
  
  <p>logback-string.xml file</p>
  
  <p>
  </p>
  
  <pre><code>&lt;property resource="application.properties" /&gt;
  
  &lt;springProperty scope="context" name="loggingFolder" source="logging.folder" defaultValue="logs" /&gt;
  &lt;springProperty scope="context" name="loggingFileName" source="logging.file.name" defaultValue="xxxx-xxxx-xxxx.log" /&gt;
  
  &lt;springProperty scope="context" name="loggingFileSizeMax" source="logging.file.size.max" defaultValue="10MB" /&gt;
  &lt;springProperty scope="context" name="loggingFileNameArchive" source="logging.file.name.archive" defaultValue="xxxx-xxxx-xxxx-%i.log.zip" /&gt;
  &lt;springProperty scope="context" name="loggingFileArchiveMaxFiles" source="logging.file.archive.maxFiles" defaultValue="10" /&gt;
  
  &lt;appender name="CONSOLE_APPENDER" class="ch.qos.logback.core.ConsoleAppender"&gt;
      &lt;!-- encoders are assigned the type
           ch.qos.logback.classic.encoder.PatternLayoutEncoder by default --&gt;
  
      &lt;encoder&gt;
          &lt;pattern&gt;[${HOSTNAME}] [%d{yyyy-MM-dd HH:mm:ss.SSS}] [%thread] [%-5level] [%logger{36}] %msg%n&lt;/pattern&gt;
      &lt;/encoder&gt;
  &lt;/appender&gt;
  
  &lt;appender name="FILE_APPENDER" class="ch.qos.logback.core.rolling.RollingFileAppender"&gt;
      &lt;file&gt;${loggingFolder}/${loggingFileName}&lt;/file&gt;
      &lt;rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy"&gt;
          &lt;fileNamePattern&gt;${loggingFolder}/${loggingFileNameArchive}&lt;/fileNamePattern&gt;
          &lt;minIndex&gt;1&lt;/minIndex&gt;
          &lt;maxIndex&gt;${loggingFileArchiveMaxFiles}&lt;/maxIndex&gt;
      &lt;/rollingPolicy&gt;
  
      &lt;triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy"&gt;
          &lt;maxFileSize&gt;${loggingFileSizeMax}&lt;/maxFileSize&gt;
      &lt;/triggeringPolicy&gt;
  
      &lt;append&gt;true&lt;/append&gt;
      &lt;encoder&gt;
          &lt;pattern&gt;[${HOSTNAME}] [%d{yyyy-MM-dd HH:mm:ss.SSS}] [%thread] [%-5level] [%logger{36}] %msg%n&lt;/pattern&gt;
      &lt;/encoder&gt;
  &lt;/appender&gt;
  
  &lt;root level="INFO"&gt;
      &lt;appender-ref ref="FILE_APPENDER"/&gt;
      &lt;appender-ref ref="CONSOLE_APPENDER"/&gt;
  &lt;/root&gt;
  </code></pre>
  
  <p></p>