title: java.lang.ClassNotFoundException: ch.qos.logback.core.util.StatusListenerConfigHelper
body: <p>What could be the reason behind this error ?
  When we will get this error ? slf4j jar is already in package</p>
  <pre><code>java.lang.NoClassDefFoundError: ch/qos/logback/core/util/StatusListenerConfigHelper
          at ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:147)
          at org.slf4j.impl.StaticLoggerBinder.init(StaticLoggerBinder.java:84)
          at org.slf4j.impl.StaticLoggerBinder.&lt;clinit&gt;(StaticLoggerBinder.java:55)
          at org.slf4j.LoggerFactory.bind(LoggerFactory.java:128)
          at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:107)
          at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:295)
          at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:269)
          at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:281)
          at net.sourceforge.cobertura.instrument.InstrumentMain$LoggerWrapper.&lt;init&gt;(InstrumentMain.java:165)
          at net.sourceforge.cobertura.instrument.InstrumentMain$LoggerWrapper.&lt;init&gt;(InstrumentMain.java:164)
          at net.sourceforge.cobertura.instrument.InstrumentMain.&lt;clinit&gt;(InstrumentMain.java:66)
  Caused by: java.lang.ClassNotFoundException: ch.qos.logback.core.util.StatusListenerConfigHelper
          
  </code></pre>