What is the meaning of the build error message "NoClassDefFoundError: org/apache/xpath/XPathAPI"?

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The build error message "NoClassDefFoundError: org/apache/xpath/XPathAPI" typically means that the class "XPathAPI" could not be found during the build process. This can occur if the required library or dependency containing the class is not in the classpath or if the class was not compiled properly. It can also occur if there is a mismatch between the version of the library or dependency and the version expected by the code.