title: org.apache.catalina.core.StandardContext startInternal SEVERE: Error listenerStart
body: <p>I am trying to start my web application on Tomcat 7, but whenever I click on the start button, I get this error:</p>
  
  <blockquote>
    <p>FAIL - Application at context path /Web could not be started</p>
  </blockquote>
  
  <p>and below lines are added to <code>catalina.log</code> file:</p>
  
  <blockquote>
    <p>Feb 08, 2012 7:21:01 PM org.apache.catalina.core.StandardContext
    startInternal SEVERE: Error listenerStart Feb 08, 2012 7:21:01 PM
    org.apache.catalina.core.StandardContext startInternal SEVERE: Context
    [/Web] startup failed due to previous errors</p>
  </blockquote>
  
  <p>How is this caused and how can I fix it?</p>