Message "Error: Could not find or load main class Sample" when running Java program

I am fairly new to Java, and I am following the tutorial from the following site:

I have successfully installed Java,  the JDK, and Ecclipse Indigo.  All of the programs have the same look and feel as they do on the tutorial, so I know the installations have been done correctly.  As per instructed, I have created a sample class, and everything looks like it does in the tutorial.  The problem comes at the end, when I run the program, and I get the message: "Error: Could not find or load main class Sample".  Everything else seems to be as instructed, and I am new enough to this that I can not figure out where to resolve the problem.  I have included a screen shot.  Any assistance would be appreciated.  Thank you, ~ Peter Ferber

Error message shows, even though instruction followed to the letter
PeterFrbWeb development, Java scripting, Python TrainingAsked:
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I am fairly new to Java
In that case, i would not use Eclipse nor any other IDE.

What you're learning now is not Java but Eclipse. There is nothing wrong with the code.

My guess is that you haven't set the main class properly in the project properties
PeterFrbWeb development, Java scripting, Python TrainingAuthor Commented:
I did figure this out myself.  In response to the error message, "The project cannot be built until the build path errors are resolved.", I did a google search and found the following site: 

The problem was a library that wasn't really doing its job.  Once I got rid of it, leaving the functional intact, the errors went away and the program ran!

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Yes, i should have enlarged the image. The class appears to have compilation errors that are not due to errors in the code shown. But ... that's a problem that's much less likely to occur were you to be compiling at the command line. The IDE hides stuff from you
PeterFrbWeb development, Java scripting, Python TrainingAuthor Commented:
My own research and followup were responsible for finding and resolving the problem.
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