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java.lang.NoClassDefFoundError: Mainprogram (wrong name: drugstore/Mainprogram) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass( at at at$000( at$ at Method) at at java.lang.ClassLoader.loadClass( at sun.misc.Launcher$AppClassLoader.loadClass( at java.lang.ClassLoader.loadClass( at java.lang.ClassLoader.loadClassInternal(