java.lang.NoClassDefFoundError: testing\SP_Test (wrong name: SP_Test)

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java.lang.NoClassDefFoundError: testing\SP_Test (wrong name: SP_Test)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:477)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:109)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:248)
at java.net.URLClassLoader.access$1(URLClassLoader.java:216)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:191)
at java.lang.ClassLoader.loadClass(ClassLoader.java:298)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:285)
at java.lang.ClassLoader.loadClass(ClassLoader.java:255)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:314)

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