java.lang.NoClassDefFoundError: Folder/FileName (wrong name: FileName)

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java.lang.NoClassDefFoundError: Folder/FileName (wrong name: FileName)	at java.lang.ClassLoader.defineClass0(Native Method)	at java.lang.ClassLoader.defineClass(ClassLoader.java:537)	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)	at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)	at java.net.URLClassLoader.access$100(URLClassLoader.java:55)	at java.net.URLClassLoader$1.run(URLClassLoader.java:194)	at java.security.AccessController.doPrivileged(Native Method)	at java.net.URLClassLoader.findClass(URLClassLoader.java:187)	at java.lang.ClassLoader.loadClass(ClassLoader.java:289)	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)	at java.lang.ClassLoader.loadClass(ClassLoader.java:235)	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)