title: Eclipse Error - "Could Not Find Or Load Main Class"
body: <p>I started using Eclipse today to develop my java programs (did not move/touch any settings).</p>
  
  <p>I try to run the Java programs, and I get this message:</p>
  
  <pre><code>Error: Could not find or load main class CLASSNAME
  </code></pre>
  
  <p>This happens for ALL my java programs, including those I developed before (and ran without problems on Eclipse). However, this was not the case yesterday; I was able to run developed programs without problem.</p>
  
  <p>I did not uninstall/change my Java installation. The developed programs run without problem when I use another IDE to run it...</p>
  
  <p>How to fix this?
  Thanks!</p>