title: Grails 2.0.4 Error opening zip file or JAR manifest missing Springloaded
body: <p>I've just downloaded Grails 2.0.4 and extracted it to /opt/grails/grails-2.0.4/ and made sure that the GRAILS_HOME environment variable is correct. But whenever I try run the "grails" command, I get the following error:</p>
  
  <pre><code>Error opening zip file or JAR manifest missing : /opt/grails/grails-2.0.4/lib/com.springsource.springloaded/springloaded-core/jars/springloaded-core-1.0.2.jar
  Error occurred during initialization of VM
  agent library failed to init: instrument
  </code></pre>
  
  <p>I don't understand what the problem could be. I've been using Grails-2.0.1 for months successfully in exactly the same way on exactly the same machine. I've tried re-downloading the grails-2.0.4.zip file in the hopes that it was a problem with the archive, but that didn't help. I also copied springloaded-core-1.0.2.jar from the grails-2.0.1/ directory, but that just caused another set of errors.</p>
  
  <p>Any idea what could be going wrong?</p>