title: Exception thrown while using logback/slf4j
body: <p>I am using slf4j 1.6.2 api jar (tried using 1.6.1 as well) - logback version is 0.9.29 (core &amp; classic). I am using jdk1.6 on ubuntu.  The exception I received is copied below.</p>
  
  <pre><code>Exception in thread "main" java.lang.NoSuchMethodError: org.slf4j.helpers.MessageFormatter.arrayFormat(Ljava/lang/String;[Ljava/lang/Object;)Lorg/slf4j/helpers/FormattingTuple;
      at ch.qos.logback.classic.spi.LoggingEvent.&lt;init&gt;(LoggingEvent.java:112)
      at ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:471)
      at ch.qos.logback.classic.Logger.filterAndLog_0_Or3Plus(Logger.java:427)
      at ch.qos.logback.classic.Logger.info(Logger.java:631)
  </code></pre>
  
  <p>I am also getting a message complaining about slf4j binding mismatch. </p>
  
  <pre><code>"SLF4J: The requested version 1.6 by your slf4j binding is not compatible with [1.5.5, 1.5.6, 1.5.7, 1.5.8, 1.5.9, 1.5.10, 1.5.11]"
  </code></pre>