What does this error mean? How do I fix it?

I apologize if this is sent twice. I don't see it on the forum anymore, and I really need an answer.
What does the following error mean? How do I fix it? Both HelloWorld.class and Hello.html are in the Java directory. I also get an error when I try to run the applet in a browser--applet noninited. I'm just trying to go through the tutorial, but they don't mention this as one of the errors possible.
In the MS-DOS prompt when I try to run the appletviewer, I get:
C:\Java>appletviewer Hello.html
load: class HelloWorld.class not found.
java.lang.ClassNotFoundException: HelloWorld.class
at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:151)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:112)
at java.lang.ClassLoader.loadClass(ClassLoader.java:262)
at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:478)
at sun.applet.AppletPanel.createApplet(AppletPanel.java:548)
at sun.applet.AppletPanel.runLoader(AppletPanel.java:477)
at sun.applet.AppletPanel.run(AppletPanel.java:290)
at java.lang.Thread.run(Thread.java:536)
Caused by: java.io.IOException: open HTTP connection failed.
at sun.applet.AppletClassLoader.getBytes(AppletClassLoader.java:224)
at sun.applet.AppletClassLoader.access$100(AppletClassLoader.java:40)
at sun.applet.AppletClassLoader$1.run(AppletClassLoader.java:141)
at java.security.AccessController.doPrivileged(Native Method)
at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:138)
... 8 more
Thanks for any help on this topic.
booktoad28

Can you post the HTML that calls for the applet?

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