title: Creating Jar file - doesn't work on other computers
body: <p>I'm trying to package my program into a JAR file so it can be used on multiple computers.</p>
  
  <p>My program is composed of <code>start.java</code>, <code>userinterface.java</code> and <code>writer.java</code>.</p>
  
  <p>The program, written in Eclipse, works perfectly on my computer. When exported, it will work on my computer but cause the following error on other computers:</p>
  
  <p><code>"Could not find the main class: start. Program will exit".</code></p>
  
  <p>Again, my program runs fine on my computer when I double click on it.</p>
  
  <p>I've tried creating the JAR file via command prompt, and my Manifest file is correct. What is happening?</p>