java.lang.NoClassDefFoundError for java.awt.event.MouseAdapter in Applet

I'm not sure why I get a java.lang.NoClassDefFoundError runtime error on the following line: this.startBtn.addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent e) { startClicked(); } }); in an Applet. It compiles fine. How can the jre not find a core awt class? I use the same line in a different applet without issues. What am I not understanding? Thanks in advance

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