java.lang.NoClassDefFoundError: aa (wrong name: HelloWorldApp)

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java.lang.NoClassDefFoundError: aa (wrong name: HelloWorldApp)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:471)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:103)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:242)
at java.net.URLClassLoader.access$1(URLClassLoader.java:210)
at java.net.URLClassLoader$1.run(URLClassLoader.java:191)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:185)
at java.lang.ClassLoader.loadClass(ClassLoader.java:292)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:279)
at java.lang.ClassLoader.loadClass(ClassLoader.java:249)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:308)

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