title: Apache Cassandra starting problem: Could not find the main class: Files\Apache
body: <p>I am trying some Apache Cassandra examples and could run the server by calling the cassandra.bat file before. I didn't change anything deliberately, but now, Cassandra will not start.</p>
  
  <p>I searched the Web for the error message "Could not find the main class: Files\Apache.  Program will exit." and found out that there may be some space in a system variable called CATALINA_HOME, but I didn't set that variable ever. Do you know about a proper solution for this error?</p>
  
  <pre>
  C:\Program Files\Apache Cassandra\bin>cassandra
  Starting Cassandra Server
  Exception in thread "main" java.lang.NoClassDefFoundError: Files\Apache
  Caused by: java.lang.ClassNotFoundException: Files\Apache
          at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
          at java.security.AccessController.doPrivileged(Native Method)
          at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
          at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
          at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
          at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
  Could not find the main class: Files\Apache.  Program will exit.
  </pre>