What does the error "java.lang.NoClassDefFoundError" with the message "com/toedter/calendar/JDateChooser" indicate?

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The error "java.lang.NoClassDefFoundError" with the message "com/toedter/calendar/JDateChooser" indicates that the Java program is trying to access the "JDateChooser" class from the "com/toedter/calendar" package, but the class cannot be found. This could be because the required JAR file or class file is missing or not included in the classpath.