Problems with JAR and manifest files

Hi
I have a simple class MyClass.class (not in a package) which contains:
     public static void main( String[] args ) {
          javax.swing.SwingUtilities.invokeLater(new Runnable() {
                           public void run() {
                               new MyClass();
     }and a manifest file Manifest.mf which contains:
Manifest-Version: 1.0
Created-By: 1.4.2_08 (Sun Microsystems Inc.)
Main-Class: MyClassand i am using the following line to create a JAR file:
jar -cvmf Manifest.mf MyClass.jar MyClass.classHowever when I try to run the file I get the following error:
Could not find the Main file. Program will exit

And another one
although this one has an answer it doens't solve mine (I have a line at the end of my manifest)

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