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The error "java.lang.ClassNotFoundException" means that the class loader (a part of the JVM that loads and manages classes) cannot find the class that you are trying to run. This error may occur when the classpath is not set up properly or when the class is missing from the classpath. In this specific case, it means that the JVM cannot find the "java" class, which is a crucial class in the Java language, and is usually caused by a misconfiguration of the SDK or JavaFX libraries. To solve this error, make sure that the correct paths to the SDK and JavaFX libraries are set up in your project and that they are correctly imported and linked to your code.