Exception in thread "main"

When running my java program I get the following error:
' java.lang.NoClassDefFoundError: reversePolishCalculator
 Exception in thread "main" '

How can I fix it?

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add the directory that reversePolishCalculator.class is in to your classpath.
set CLASSPATH=<path to class file>
java -cp . reversePolishCalculator

or something

assuming you are trying to run reversePolishCalculator

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A slight variation: you can also try adding ;.; to the end of your classpath.
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